"This jet black wafer hums quietly, and seems to quiver with potential energy."
An Antimatter Cell is one of the types of Energy Cells available in Caves of Qud.
As an unknown Artifact, it may appear as "small trinket" or "small cube".
It is the longest lasting Energy Cell in the game.
Occasionally dropped by Leering Stalkers and can be found at random in the lower levels of the Underground.