Jemal, I will assume that William drank the potion before charging. He still failed the save.
Verra's next two shots against the creature are a little less effective than the first (20 and 15 damage), but the elemental damage is clearly taking its toll.
Bellus waits near Darian, knowing that his skills would find little purchase against the undead beast.
The Taphos claws Zelestine with its huge front claws, inflicting terrible wounds (20 and 18 damage). It also grabs her with its left front claw, preventing her from attacking with the greatsword.
Verra sees activity in the bear's left eye, and suddenly William stops moving. Verra recognizes the symptoms of a brain lock.
Tarkus moves to one end of the wall of force, casting a spell as he goes. Tuskaar moves to the other end.
Darian casts fly, then strengthens Groknar once the half-orc draws near. The barbaric warrior then runs past the wall of force to the side of the undead monster.
Once Groknar passes the wall of force another whitefire goes off, engulfing William, Tuskaar, Groknar, and Verra (all saves made, 10 damage each). Tuskaar is looking somewhat hurt (23/53 hp).
Third round coming up. Actions, please.