When its HP reaches ⅔ and ⅓ (around 2700 and 1350 typically), it will trigger a explosion (it does not take any recoil damage or anything from this) on its tile that deals 500 damage to zombies in range. This can only trigger once and can’t be triggered again if the fusion is healed back to its previous degrees.
On death, it will explode itself on its tile, dealing 1800 Cremator damage to zombies in range.