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Add new cave access to underdark near the groove. End starts when finishing encounter in Groove, and get into the Groove proper, and can talk to Belak. After a talk with Belak and learning what has happened. The drow will surround and ambush, asl to surrender, Seelnay will assist Drow if in group, but make them keep players safe and alive.

regardless if they start fighting or surrendering, or try to stall the talks, the caves will start collapsing (after effect of killing some of those tree monsters in the pre groove). And the only safe way to escape will be to the underdark with the drow. New offer of surrender or left alone to die.

Either stop to move to Act2, or let them sit and talk around campfire to get to know the Drow first.