Black Staff

 is a arcane item in Total War: Warhammer II.

Description
The caster draws on unstable power from the Realm of Chaos to charge their spells.

Effects

 * Type: Augment of the Winds
 * Duration: 30 Seconds
 * Cooldown: 90 Seconds
 * Uses: 3 Per battle
 * Target: Self, ally 200m
 * Increase to power recharge
 * Increase to power reserves
 * Causes damage to unit

Source
https://twwstats.com/abilities?q=black%20staff&right=5568484908994462459