Secondary professions for a Necromancer

Necromancer Warrior

 * Skills from the Tactics line such as "Shields Up!" can help the Necromancer and his teammates.
 * With low armor and mediocre self heals, Necromancers should not be close to battle, so melee weapons are a bad choice.

Necromancer Ranger

 * Serpent's Quickness can accelerate slow recharging spells.
 * Energizing Wind can cut down the cost of 25-energy skills such as Animate Bone Fiend to manageable levels.
 * Many bow attacks cause conditions, but Plague Sending or Plague Signet combined with self inflicted conditions such as Blood Drinker and Chilblains is a more effective tactic.

Necromancer Elementalist

 * Glyph of Lesser Energy can be used for energy management.
 * Thou often used, the Soul Reaping nuker is a poor substitute for a true Elementalist.

Necromancer Mesmer

 * Echo and Arcane Echo can be used to increase the damage potential of some of the longer recharging skills. This is especially useful with Spiteful Spirit.
 * Skills in the Inspiration line such as Power Drain can be used for energy management.
 * Mantra of Inscriptions combines with Signet of Lost Souls and Leech Signet for additional energy management.

Necromancer Monk

 * The 55hp solo Necromancer is an excellent farming build, and combines well with Spiteful Spirit and Spoil Victor.
 * Utility skills such as Draw Conditions and Convert Hexes can aid party survival.

Necromancer Assassin

 * Deadly Arts hexes such as Enduring Toxin can be combined with a Necromancer's degen hexes.
 * Signet of Toxic Shock and other deadly arts combines well with Toxic Chill.
 * Enduring Toxin, Mark of Death and other deadly arts hexes combine well with Soul Barbs.
 * As with warriors and dervishes, the Necromancer's light armor and poor defensive skills make Daggers a very dangerous proposition.

Necromancer Ritualist

 * A Necromancer spirit spammer rarely has to worry about running out of energy.
 * A Necromancer can function as a healer using Restoration Magic, managing it's energy with the Soul Reaping bonus.

Necromancer Paragon

 * A minion-master can use "Fall Back!" to heal his army on the move.
 * The abundance of spear attacks that impose conditions are tempting, but Enfeeble is a better choice for Virulence necromancers.

Necromancer Dervish

 * Mystic Regeneration can combine with necromancer enchantments such as Dark Bond and Aura of the Lich to created a self-sufficient minion master.
 * As with Warriors and Assassins, a Necromancer's light armor and poor defensive skills prevent the Scythe from being a useful tool to the Necromancer.