Well, let me just say that the sludge looks like what the word Drek means.
Drek's arrow whizzes by (rollled an 8). The sludge moves to 30N25E and takes a swing, hitting solidly (rolled natural 20, but 11 on crit roll) for 6 points of bludgeoning damage and 2 points of acid damage. Drek is at 1 HP (toughness proves useful, after all).
Drek's move.