Rift Quest:A Bit of Subterfuge  

1. Use the disguise at the entrance to Frayworn Rock
2. Find Nathor Kull (up the first ramp from the entrance and to the right), speak to him, then follow him up one platform. When he is standing in front of the empty cage, click the extractor to end his reign of evil.
3. Take the Spirit Shard to Bardra Mortain

You may want to make sure you are bound at Scarwood Lift Base, that your Soul Recall is ready. You can walk out of the cave but you may have to fight a few extra mobs, your choice.