In the underdark, near the selune temple ( but I could only walk there from the beach) are petrified drow.
There are 2 locations at the temple you can jump to access this area without running all around the UD.
If you are inside the temple facing the gate out there are stairs on the left and right that lead to landings overlooking the entrance stairs(the landings the gatehouse ladders are on that lead up on top of the gatehouse). The left hand side landing has 1 of the petrified drow just below it. You can jump from the landing down to that drow(though it will cause you to go prone).
You can also jump from the stairs outside the gate to the brazier and follow that around the landing to where that drow is.
Myself I left my party up on the landing overlooking the closest drow and had my MC only jump down. Then I took him over to check things out and popped the Spectator. I immediately ran him back to the drow beside the landing and kept him there. The Spectator starting freeing all the trapped drow and they all started fighting. I left my toons over at the temple using ranged attacks on anything that came close enough till the drow won(2 were left standing but wounded) then finished them off np.