Insatiable

Insatiable is a passive ability in the Attunement of Hunger tree of the Voidwalker subclass. While Devour is active, a killing blow refreshes Devour's timer and restores grenade energy by 16% to 24%, depending on the target's tier. Player kills grant 24%.

Patch 2.8.0 changed the flat 20% grenade gain to this tiered range. The Witch Queen folded the grenade-energy-on-kill effect into the Devour keyword and moved the longer-duration property to Echo of Persistence.