Vampire
Increases active-ability damage in proportion to Coen's current health. It pulls directly against Blood Surge and Ravenous Flock, both of which are paid for in health — which is the interesting part of the Vampirism tree rather than an oversight.
As with Unholy Vitality, August 2026 coverage lists this in the tree's Abilities column while describing a passive effect. The published column is recorded without asserting it over the mechanical reading.