As the Title. I think i actually broke Several Questlines regarding the Goblin Camp. Here is what i did:
-Killed all the Leaders
-Got beneath the Temple with the hidden Leaver and transitioned into the Underdark.
-Right after transition got level up
-Teleported to Camp and leveled all Companions
-Went to sleep and appeared in the Grove with Halsin there and thanking me
I think that is supposed to happen as he is only guarded by a few goblins and wargs in the Warg Pens area - if you kill all the other leaders he probably just kills those and heads home