Ayan, Dark Conduit

Ambush - An ambush unit can be played at the end of the enemy player's turn, or any time they are attacking you. If you played against a Killer or Relic Weapon attack, an Ambush unit will jump in the way to block that attack.

Decay - When this deals damage to unit or relic weapon, that card’s strength and health (or armor) are permanently reduced by that much.