Edit: The Guilding Bolt strikes true, and the strange odor of pustulent demonic eye goo sizzling in the heat of radiant magical energy fill the chamber.
The black shadow rears up and assumes an elongated, vaguely human shape with two eyelike circles rimmed with a cold blue light set in the hump of its head. Its appendages make a striding motion as it glides toward the party.
Domarc, Leth, Zangua, you're up.
Rolls
Felor's Guiding Bolt vs demon - (1d20+6, 4d6)
1d20+6 : (16) + 6 = 22
4d6 : (2461) = 13