Anders glares at the creature stonily. Raising his arm, he points a single finger at the atrocity and barks, “Ra-Ket!” A shimmering missile of force streaks forth from his finger, striking the ooze at the midpoint (10/19, 4:35 NPC Anders rolls 1d4+1 to damage the ooze with a magic missle. Total: 3 +1 = 4) with uncanny accuracy.
Accompanied by a ripping, sucking noise, a great rend opens in the slime, extending halfway down the median of the thing. This occasion, the creature does not immediately seal itself. Perhaps your combined assaults are at last telling.