using a thief with invis potions, or good HS/MS set up an empty room to whack em in, minsc with Liracor (or anyone with it for that matter) is waiting in it while the rest of your party waits in a room farther away, keep doors closed at all times... have the thief behind the door, open it with warrior type, and lure 1 or 2 hulks in, have the thief slam the door before more than 1 or 2 go through, then drink potion to avoid confusion, a good level (8-10 fighter) with high str can usually take out one or two without too much harm coming to him, a higher level fighter should have an even easier time of it. Of course send in a priest to heal up the fighter, or use potions, whichever you prefer before starting round 2.

wands of cloudkill can substitute for the fighter if you feel lazy (the cost of recharging them is well worth it, due to the fact that wands ignore MR, not elemental Resist, but all MR)

try giving someone the stew and castn haste. let him run to the cell and place the stew. make sure the critters follow then lock the doors