Eels

Apparently there'd been a plan for that tank of squig-eels I've seen earlier, but since the generator was about to fire, there wasn't time for nothing clever any more. So Grotsnik bust open a hatch in the side of the boss' armour, right over his guts, and just upended the whole tank into it, water and all. I'll tell you now: I'd bet every tooth I have that he did that for no reason but his own amusement.

Ghazghkull Thraka: Prophet of the WAAAGH!