Guide to defeating doppelganger

The following tactics have been suggested to beat the Doppelganger:

General Tips:

 * In general, the Doppelganger will equip the same skills you equip, so don't equip any skill you wouldn't want used against you.
 * Think very carefully before bringing any skill that can be used to heal yourself.
 * Equip lots of slow-casting self-buffs: the less useful in the one-on-one fight, the better. The AI will waste time at the beginning of the fight casting every buff on itself.
 * For all ranged attackers, stay on higher ground. Ranged attacks from higher to lower ground do more damage.
 * Cast any self-buff enchantments before stepping on the third stone that starts the cutscene. They will last into the match. Remember that the cutscene plays in real time, and the timed (as opposed to maintained) enchantments may expire if you do not skip it.
 * Dodging arrows: Stand as far away from your mirror as you can be and still cast spells on it, and tap Q and E (Or strafe left and right, if you have them rebound) as fast as you can. Tap them both, many people hear that and try to only tap one. This twitchy movement will cause your mirror to shoot wide and miss most of his shots (You can do it slower, but doing it really fast takes less practice)

Elementalist Tips:

 * Bring lots of skills with very long cast times, and only one or two spammable skills. The Doppelganger will usually focus on the slow-casting skills and allow you to gain the advantage by wise use of the spammable skills. This is not foolproof, but the AI tends to use all of its skills relatively evenly, whereas a human is smart enough to focus on different skills at different times.
 * Do not equip skills that could disrupt your spell casting (like Gale or Earthquake).
 * Bring a lot of skills that cause Exhaustion and one or two that do not. Don't use any skills that cause Exhaustion, but let the AI do so. It will run out of energy before you do.
 * If you're an Elementalist/Mesmer or a Mesmer/Elementalist, an easy way to win without taking any damage at all is to blind the Doppelganger with Blinding Flash, hex it with Empathy, and stay within melee distance. You can keep the Doppelganger blinded indefinitely by recasting Blinding Flash, and let it kill itself with Empathy.
 * If you are an Elementalist/Mesmer, equip Obsidian Flame, Arcane Echo and Mantra of Recovery and fill the rest of your bar with other spells. As soon as the battle starts cast Arcane Echo, Obsidian Flame and Mantra of Recovery. It's important to have high enough energy via energy storage to resist the exhaustion, but if done right, your doppelganger should be dead in 10 seconds or less.
 * Bring Air Attunement, Earth Attunement, Fire Attunement, Water Attunement, Flare, Fire Storm and Meteor Shower, with all the points in Energy Storage and Fire Magic. While the Doppelganger casts the attunements, cast Fire Storm and Meteor Shower, then spam it with Flare.
 * Bring Iron Mist, and no lightning damage.
 * Bringing Mark of Rodgort along with a fire damage weapon lets you employ a constant -7 health degeneration, while suffer only the doppelganger physical attacks.
 * For the E/Me equip only Flare and Distortion and hammer the keys like your lifes depends on it (it does). The distortion will kick in whenever available and make most of its physical attacks miss. Enough flare and you'll quickly see its life go down. This method should get you the bonus every time
 * Start out with fireball, cast arcane echo, get close enough to double-cast phoenix... with luck, you should rack on lots of damage, without taking much yourself. (Beware DoT spells while you're busy double-casting- if he drops Firestorm on you, get out of there!)
 * Use only Stone Daggers, with 16 Earth Magic.
 * If you are an Elementalist/Mesmer or a Mesmer/Elementalist, bring any elemental attack set and equip Physical Resistance. The extra damage caused should give you an advange over your doppleganger.

Mesmer Tips:

 * An IW Mesmer would have no trouble defeating doppelganger. If you skip the cinematics, you can easily cast spells such as Illusionary Weaponary, Illusion of Weakness, or other enchantment before-hand, killing him very quickly. Using a +3 Illusions rune in addition to your mask would mean that you have four extra levels in all those skills, and should guarantee success. Equiping Illusion of Weakness would also make the doppelganger cast it at the beginning, giving you lots of spare time to attack; it is easily possible to kill him within 10 seconds. Another possibility without Illusionary Weapons is to use Illusion of Weakness in combination with multiple degeneration skills. Degen does not trigger Illusion of Weakness, and this makes killing him very quick.
 * Bring Backfire and Empathy and maybe some spammable skills (like Flare, Wastrel's Worry or something with a really fast cast and recharge time). Put all points in domination.  The AI is not smart enough to refrain from casting or attacking while hexed with those skills and will quickly kill itself. Once they are cast, do nothing.  The Doppelganger will kill himself shortly.
 * Power Spike and Diversion are very useful if coupled with a few Elementalist skills with long casting times. The Doppelganger will tend to use slow-casting skills early, so these two skills can be used effectively. Be careful not to use the Elementalist skills yourself, because the computer AI is deadly in detecting such spells and interrupting them.
 * Illusion of Haste is often a good idea. The Doppelganger will waste time casting it (and give itself an enchantment you can use Shatter Enchantment on), but since neither of you is likely to be chasing the other, it will do little good.
 * Don't bring a lot of interrupts. The AI almost always has faster reflexes than you, so you'll get interrupted more than it will. Only bring interrupts if you have also equipped a skill with a very lengthy cast time (let the AI use this skill, ignore it yourself).
 * Be careful if you bring any skills that damage the opponent's energy, such as Energy Burn or Energy Tap. Although the exact amount of energy that the Doppelganger has is unknown, it's almost certain to have more than you.
 * Ether Lord can be extremely effective or completely worthless, depending upon luck. If the Doppelganger casts it early on, it will have a distinct energy disadvantage. You may wish to combine it with Mind Wrack in hope of the AI draining its own energy with Ether Lord, thereby triggering Mind Wrack.
 * Allocate all your attribute points in Domination Magic and put the remaining points in Illusion Magic and equip Distortion and Empathy. Keep the doppelganger constantly hexed with Empathy while always keeping yourself under Distortion and it should attack until it dies. Also, try to keep in its melee range so it will have a higher attack rate.
 * On the same note, if you have access to Signet of Midnight {which is highly unlikely}, bring that instead of Distortion. Also bring skills that will allow him to further increase his attack speed (such as Frenzy and Tiger's Fury).
 * The AI generally uses skills left to right so put lots of useless spells on left and backfire on right. If you cast backfire in the first few seconds the doppelganger usually dies in about 6 seconds.

Monk Tips:

 * Consider bringing Healing Breeze. The AI currently will not use Healing Breeze for ordinary healing. However, it does use Healing Breeze to counter health degeneration from conditions or hexes.
 * Consider Retribution. The AI does not cast this enchantment on itself, and is a good way to deal extra damage without any casting costs.
 * Bring Smiting Prayers. You can reportedly cast them faster than the AI will. You can defeat the Doppelganger by only using Zealot's Fire and Reversal of Fortune.
 * Bring useless maintained enchantments. If you bring at least four, then the AI will cast them all on itself and have no energy regeneration (or even degeneration if you have more than four). Divine Boon will cost them extra energy when they heal; when they run out of energy they will stop healing and have no benefit. Life Attunement will make them deal less damage; since they cannot heal due to lack of energy they get no benefit. Blessed Aura is good too, since they cannot cast enchantments due to the afore mentioned lack of energy. Holy Veil is good if you don't plan to use hexes.
 * If you are a Necromancer/Monk or Monk/Necromancer, bring Scourge Sacrifice, Awaken the Blood and Order of the Vampire. No other skills are needed, merely cast Scourge Sacrifice on the Doppelganger, and wait for it to kill itself. Low-levels can try bringing Defile Flesh, Dark Pact and Awaken the Blood and not using them, which has a similar effect, making sure Healing Breeze and Reversal of Fortune (and Pacifism to give time for health regeneration) are there to keep yourself alive.
 * If you are using a Necromancer/Monk or Monk/Necromancer that has been to Cantha, bring Scourge Sacrifice, Awaken the Blood, Cultist's Fervor and Order of Pain. Simply use Sourge Sacrifice and watch your Doppelganger sacrifice more than 100% health (it will use Sourge Sacrifice, followed Awaken the Blood and Cultist's Fervor before using Order of Pain)
 * If you are a Monk/Necromancer or Necromancer/Monk, bring useless enchantments, such as the ones mentioned above, and Rend Enchantments. Cast the enchantments on yourself and the doppleganger will lose over 200 health when he does cast this spell. Also, bring other skills that require him to sacrifice health, such as Defile Flesh, Dark Pact, etc.
 * Just Healing Breeze (with 9 or more ranks in Healing Prayers) and Banish can be used to defeat doppelganger with no trouble.
 * An alternative is to bring only a staff (or any other weapon) and Healing Breeze. Keep Healing Breeze up and defeat the Doppelganger with your staff. Depending on staff stats this is extremely fast.
 * Use Pacifism on the doppelganger when you are low on health, then cast Healing Breeze. You will be able to safely regenerate a large amount of health before Pacifism expires.
 * Another way (fairly expensive) is to use a Mo/any Invincible Monk build to tank the Doppelganger and slowly kill him with a weapon or careful usage of Zealot's Fire.
 * Protective Bond is another option, as Monk Primaries will often not have the punch to deal over 5% damage to the Doppelganger, while it has no trouble triggering the Protective Bond effect. No other skills are needed.
 * Max your Smiting Prayers, but spend 0 points to Healing. Bring Scourge Healing and Orison of Healing. Fill the rest 6 slots with smiting skills. Hex the Doppelganger with Scourge Healing, do some damage on him/her, and he/she will kill him/herself with Orison! Warning: don't use Orison while you are hexed with Scourge Healing! Don't bring hex removing skills!

Necromancer Tips:

 * Equip hexes such as Malign Intervention that take time and energy to cast but won't accomplish anything useful in the one-on-one fight. The AI will waste time and energy casting them on you.
 * Bring spells that require a health sacrifice: the less useful in the one-on-one fight, the better. The AI will waste its own health casting them.
 * If you bring lots of health sacrifice skills, bring Awaken the Blood so the Doppelganger damages itself even more through sacrifice.
 * Don't bother with Life Siphon or Life Transfer. The AI will likely also cast them on you, so at best it will be an even trade and cancel out.
 * Remember that there will be nothing dying in this battle, so not only will Soul Reaping be worthless, anything that requires a corpse (such as any Wells, any Minions, Soul Feast, Consume Corpse, Necrotic Traversal, etc.) will do you no good.
 * For a Necromancer/Warrior, equip a sword and shield. The Doppelganger will have an axe and bow.  You will have a distinct armor advantage.
 * Even though it carries a healing component, Order of the Vampire is one of the most effective skills to bring, because it carries a relatively high health sacrifice and only lasts 5 seconds; the Doppelganger will usually recast it very frequently, damaging itself in the process far more than it damages you. Dark Fury also works in much the same manner, but is exceedingly difficult to obtain by the Doppelganger battle.
 * If you find that the Doppelganger attacks more than it casts, bring Enfeeble and Shadow of Fear. If you find that it casts more than it attacks, bring Desecrate Enchantments and a lot of worthless enchantments.
 * If you have a reliable way to regain energy (like many Inspiration Magic skills, or certain Elementalist skills), bring Malaise. The health degeneration will hurt the Doppelganger more than the Energy degeneration will hurt you.
 * If you are a Necromancer/Monk or Monk/Necromancer, Rend Enchantments is very risky but can be very effective. Give yourself a lot of enchantments that will not benefit the Doppelganger when it uses them on itself, then allow yourself to be hit with Rend Enchantments. The resulting "recoil" from Rend Enchantments will do a very large amount of damage to the enemy. It is important, though, to make sure that you bring enchantments that will not benefit the Doppelganger when it casts them on itself, as you do not want to bring any other methods of enchantment removal (lest the Doppelganger cast them instead of Rend Enchantments).
 * If you are a Necromancer/Monk or Monk/Necromancer, bring Scourge Sacrifice, Awaken the Blood and Order of the Vampire. No other skills are needed: merely cast Scourge Sacrifice on the Doppelganger, and wait for it to kill itself.
 * On top of skills that sacrifice health, skills that inflict conditions upon yourself are great opportunities. You are smart enough to stay away from Signet of Agony and Chilblains (not to say that those skills are not useful, merely that they do not help in this particular situation), but the AI is not, thereby cursing itself with Poison and Bleeding while you only take a small amount of damage.
 * All in all, the most important thing to remember as a Necromancer is that the Doppelganger will hurt itself more than you will be able to. Human necromancers have a difficult enough time balancing the proper blend of sacrifice and benefit; the AI will not realize that it is killing itself and will merrily spam the sacrificial skills as fast as it can for the entirety of its short life. Certain builds can induce the Doppelganger to kill itself without the player doing a single thing.
 * Bring Price of Failure and unequip your weapon if you intend on mostly casting.
 * With Awaken the Blood active, Defile Flesh and Blood Renewal have a total sacrificial cost of over 65% life. Throw in a couple more useless sacrifice skills and the Doppelganger will kill itself.
 * If you have access to Virulence, bring Chilblains and/or Signet of Agony, then use it on the Doppelganger's self-inflicted condition; make sure you don't bring a skill that can give a condition.
 * Enfeeble and Insidious Parasite are a good combination. Keep both active on the Doppelganger and it will kill itself while healing you. If you are one of the many that get a run to Droknar's Forge before ascending and capture Spiteful Spirit in that area, it can come in very useful here as well. Just ensure that you get up close to him so he attacks you with his axe and you're not attacking with your weapon as you will likely have Parasite, Enfeeble, and SS (if you chose to bring it) and with high Curses he will die very quickly.
 * For an easy but slow win equip only Price of Failure. Use it on the Doppelganger, take a little more distance and keep strafing left and right changing the direction often. The Doppelganger will miss you with his arrows and take damage. Recast Price of Failure every 30 seconds.
 * Suggestion for a Build: Curses: 12+1, Blood Magic: 10+1, Enfeeble, Insidious Parasite, Price of Failure, Awaken the Blood, Blood Renewal, Demonic Flesh, Malaise, Defile Flesh. Cast Enfeeble, Insidious Parasite, and Price of Failure and keep all three active on the Doppelganger and then make sure that you are within melee range so that its attack rate is higher.  The combination will make the Doppelganger take more damage than it is dealing.


 * Another Suggestion for a Build: Curses: 10+1, Blood Magic: 12+1, Demonic Flesh, Awaken the Blood, Enfeebling Blood, Enfeeble, Plague Sending, Rigor Mortis, Malaise, Rend Enchantments. Cast Enfeeble, Rigor Mortis, and Shadow of Fear on doppelganger. He will use plague sending to send them back to you hurting himself for -10% hp. Awaken the Blood, Demonic Flesh and Enfeebling Blood are more ways to add to the sacrifice damage. Rend Enchantments is to get rid of his Demonic Flesh causing him to cast it again and he will. If you take a shortcut and cap Offering of Blood sub it in for Malaise.

Ranger Tips:

 * Bring many slow-casting Nature Rituals like Winter and Quickening Zephyr (the less useful in the one-on-one fight, the better). The AI will waste time casting the rituals while you apply the attack.
 * Three main skills to equip would have to be, Throw Dirt so you can blind them and get a few more points, Troll Unguent if you're a person with a tendency to lose health quickly, and Distracting Shot so if you have the Unguent equipped, then its best to use Distracting Shot while he/she's trying to heal him/herself
 * Longbows and slow-firing bows such as Horn Bows are generally a bad idea. Bring the quickest firing bow that you own (Short Bow or Half Moon) so you can get off as many shots as possible while your double is casting Nature Rituals or traps. By the time they get around to attacking you, they're nearly dead already.
 * Equip a lot of effective bow attacks, once the battle begins, charge right in next to it and attack, because it will disable him/her using bow attacks, since they will equip their axe.
 * Bring evasion skills like Dodge and Lightning Reflexes, Throw Dirt, and traps. You will avoid your doppelganger's attacks, but can lead him onto your traps because he will chase you to throw dirt.  In this way you can beat your doppelganger without ever firing an arrow.
 * Your pet will join you in the fight if you equip Charm Animal. The Doppelganger however will not have a pet, so you will gain an advantage if you equip skills which require a pet.
 * Bring 7 slow-casting Nature Rituals and the elite, Poison Arrow. As long as you are up close, right next to him, he won't use poison arrow, because he's using his axe. He will cast all 7 Nature Rituals. This is possible at very low levels, and works to get the bonus.
 * Take Charm Animal with you and 6 skills that are specifically for your pet (like Bestial Pounce). Also take Apply Poison (or the elite Poison Arrow). Stay close to the Al. Since the Al has no pet, he cannot use the pet-skills. As long as you stay close, he will use the axe and not the bow, so he won't be able to use the poison skill either. Set Beastmastery on maximum attribution points. Your pet will do most of the work for you and will get you the bonus too.
 * Another good way to defeat the Doppelganger is to bring at least 5 spirits(This is for R/Mo only), Balthazar's aura, and symbol of wrath, oh and max out your smiting prayers. Before you step on the third circle, cast Balthazar's Aura, step on the circle, skip, get close to the Doppelganger, and cast Symbol of Wrath. Then while he is casting spirits (he may cast symbol of wrath before that), attack him with the spells and a bow.

Warrior Tips:

 * Equip Frenzy but don't use it. The AI will use it, putting itself at a significant disadvantage in the one-on-one fight. Couple this with a few energy based attacks which you can use right away (ie Power Attack, Seeking Blade/Irresistible Blow/Swift Chop, Griffon's Sweep, etc.) and the Doppelganger should be down in 15 seconds or less.
 * Bringing Hammer Mastery or Swordsmanship skills exclusively does not work. Despite wielding an axe, the Doppelganger will still be able to use these skills.
 * Activate skills in the most effective order for a fast take-down. Sever Artery works best before Gash but your opponent doesn't use it that way.  Similarly, do not use Final Thrust until your opponent is below 50% health; your Doppelganger doesn't understand that, and will waste a lot of adrenaline by using it prematurely.
 * Any skills with a "Lose All Adrenaline" component, such as Wild Blow, can be a great benefit. Ignore them yourself, but let the AI waste its own adrenaline using them on you.
 * If your secondary class has high-energy spells, bring some of those that don't really do anything useful. For instance, if you are a Warrior/Mesmer, bring Imagined Burden.  It uses 15 energy, and slows 50%.  That won't matter since you aren't running anywhere, but it will use 15 energy from the Doppelganger.  This may be appropriate for other classes as well, but has only been (very successfully) tested on Warriors.
 * An easy win for W/Mo in under 10 seconds is to bring Life Attunement and Frenzy with 12+ hammer mastery.
 * By far the easiest way for a Warrior primary to Ascend is to unequip all skills, and merely take a maximum damage sword (15-22 damage). Get in close, and hack away. As long as you actually have a full set of high level armor (either the armor from the various collectors, or a complete set from Droknar's Forge), Ascension in this matter should be approximately 35-40 seconds, depending on the amount of critical hits
 * Because the Doppelganger uses a Chaos Axe, a tactics Warrior should consider Riposte and/or Deadly Riposte. Both skills can deal large amounts of damage to the Doppelganger, but won't be used against the player.
 * Bringing Healing Signet could be useful if you have a fast attack rate or high-damage hits. Once the Doppelganger is hurt, it will cast it upon itself. But, with the &minus;40 amour that the signet delivers during the duration of the spell, you can deliver more damage than it can heal; the Doppelganger will continue attempting to heal itself until it dies. This is a good time to finally use Frenzy.
 * One way to kill him is to max out tactics and bring only Gladiator's Defense. Put the rest of your Attribute Points in your chosen weapon. When you start attack him after using Gladiator's Defense, and when you see him use it stop attaking. When you think it is done, attack him and use Glads. Repeat. This should take less than 50 seconds if done right.
 * The Doppleganger does not use a shield, so consider shield moves such as Shield Bash to help knock your doppleganger around or Shield Stance to prevent damage.

Ritualist Tips:

 * Equip Soothing, Shelter, Shadowsong, Pain, Bloodsong and Dissonance and bring your Communing attribute as high as possible. As soon as the fight begins start summoning spirits, starting with Dissonance (to keep him from summoning a spirit army himself) and going backwards in the list. You don't need Soothing and Shelter, they are only equipped to keep the Doppelganger busy and reduce the chance, that he also starts with Dissonance. Typically he will be dead within 25 seconds.
 * Equip only Vengeful Weapon, and have max restoration magic. Repeatedly spam on yourself for an easy win.