Verified for patch 16.8.1

Void Gauntlet

Combat start: Store 30% max Health and 2.5% more every second. On death, unleash the stored Health as magic damage split between enemies within 4-hexes.

[Unique - only 1 per champion]

Source

Artifact

Effects

Health: 300
HexRadius: 4
InitialPercentHealthStore: 0.3
PercentHealthStore: 0.025

Void Gauntlet enables

On Death On the Menu

Effect fires when the source unit itself is killed. Common on items that store value during combat and discharge it as a final payload (e.g., The Annihilator, Void Gauntlet).