Sacrifice

Sacrifice is when a Necromancer uses his/her own blood for performing rituals. Unlike real necromancers, Guild Wars necromancers only sacrifice their own blood to power their dark magics.

A subset of Necromancer skills involve the user losing a percentage of their maximum health while casting them. The amount of health sacrificed ranges from 8% to 33%, based on the skill.

Since users lose their health based on their max health, it is possible for a Necromancer to kill himself by casting a sacrifice skill while the his current health is less than the percentage of health needed for the sacrifice.

Skills that sacrifice health
These are all Necromancer skills.
 * Blood Magic Skills:
 * Barbed Signet (8%)
 * Blood Renewal (25%)
 * Blood Ritual (17%)
 * Blood is Power (33%)
 * Dark Fury (17%)
 * Dark Pact (10%)
 * Demonic Flesh (20%)
 * Offering of Blood (10%)
 * Order of Pain (17%)
 * Order of the Vampire (17%)
 * Signet of Agony (10%)
 * Touch of Agony (10%)
 * Curses:
 * Defile Flesh (20%)
 * Enfeebling Blood (17%)
 * Lingering Curse (10%)
 * Plague Sending (10%)
 * Death Magic Skills:
 * Blood of the Master (10%)
 * Verata's Aura (33%)
 * Verata's Sacrifice (15%)

Skills that Rely on Sacrifice

 * Necromancer Skills:
 * Dark Aura

Skills that Affect Sacrifice

 * Necromancer Skills:
 * Aura of the Lich
 * Awaken the Blood
 * Monk Skills:
 * Scourge Sacrifice