Booyahg Culk can be found on the secluded northern edge of the Goblin Camp with several other goblins and bugbears who have fallen into a drunk slumber. If the party attack the cracked wall to gain entry into the Shattered Sanctum, it causes all nearby enemies to wake up and initiate combat. The party can also startle Culk awake by landing nearby with a Jump. It is possible to avoid combat by passing a skill check.
[PERSUASION] Hush now. Go back to sleep. (DC 10)
[DROW] None of your concern. Back to your stupor.
[ILLITHID PERSUASION] [WISDOM] Nothing. Lie back down and be silent. (DC 2)