Duncan the Black

Locations

 * Depths of Tyria
 * Slavers' Exile
 * Duncan the Black (Dungeon)

Hints for defeating Duncan the Black

 * The safest way to defeat Duncan is to let a Spoil Victor Necromancer or Mesmer with Backfire, Mistrust, Guilt, and Empathy under Mantra of Recovery stand on the lower floor beside the stairs, in the corner formed by the upper floor. Neither Duncan nor the spirits he summons will hit that player there, but Protective Spirit must still be kept up on that player at all times to prevent an instant kill from Duncan's Channeling Magic spells.
 * All forms of health degeneration can help with getting Duncan's health down too. That player keeps up the damage hexes on Duncan, who will attack and cast spells all the time. Duncan will not hit with attacks but still take damage from the hexes.
 * A player with Swap, Gaze of Fury or Unnatural Signet can move his spirits to a much more manageable position or destroy them as necessary. Consider the spirits of Recuperation as your primary targets.
 * Consider using Pain Inverter if you're spamming a damage skill on him, it will do a free 80 damage back to him.
 * Another method to defeat him is to let a party member die near him and have a Necromancer spam Signet of Sorrow on him.
 * A lot more pop up touchers are added in Hard Mode and can be deadly.
 * Two more groups of spirits are summoned when you fight Duncan. Each group includes two Disenchantment spirits and you cannot avoid facing at least one of these groups.
 * Use Consume Soul to destroy these spirits instantly, especially the Spirit of Disenchantment.
 * Consider using Swap to pull the Spirit of Disenchantment. If two party members bring swap, the process is very quick and you can remove all the spirits to a safe spot where they can affect neither Duncan nor you.
 * Using Recall also helps when swapping the spirits near Duncan; this way you avoid being spiked by Duncan's Channeling Magic.