ADU Core

The ADU Core, also called an ADU Battery, is a healing item used in Onslaught. Players pick it up and throw it at the Advanced Defense Unit (ADU) to restore its health, and throwing one at a damaged defense can heal it too.

Saboteurs and Champions each drop one. During the Augment Wave, which begins on the third and ninth waves of a set, Skybombers and Demolitionists drop two instead of one.