Sacrifice

The Necromancer is known for using own blood as a power source for their dark magic.

A handful 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 (33%)
 * 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 involve sacrifice in other ways

 * Monk Skills:
 * Scourge Sacrifice
 * Necromancer Skills:
 * Awaken the Blood
 * Dark Aura