Vampirism

Vampirism is a power-type skill which transforms all of the player's health and a portion of missing health into rally which is effectively a risk/reward option of gaining health.

Trivia

 * Prior to v1.9, Vampirism was an area of effect skill that made enemies bleed and drop healing items. It was rendered unusable when the player activates it, and could be recharged if they drank a flask.
 * The skill was also recharged when entering the safe passage between biomes, but not when exiting them.
 * Enemies would drop the healing item even if they stopped bleeding but weren't killed.