Just a quest from him called "Freeing Kaldimar". Pretty simple. Go to orc fort in icefall, scout it out (updates as you near the fort), look for Kaldimar's cell, go in fort find him (cell straight across from where you enter the jailroom area) speak with him. You have to kill the 'Coldeye Keymaster' blue to 73. Solo pretty easy (73 necro). Go back in and speak with Kaldimar again, he walks out and poofs. Go back to Loren in Crescent Reach for reward.
Reward is "Barrier of Black"
Haven't talked to Loren yet to get it but it's secondary and the icon looks like a shield. Unlike any that I've seen. Don't know what the equiped graphic is. Stats are as follows: