Unlock the collar.

You make quick work of the collar around the dwarves neck. With a satisfying click the collar opened up and fell of the dwarves neck. "Y-you saved my life, and freed me too. I'm enterally grateful. Thank you my friend." The dwarf bowed and pledged himself to you for the rest of your life in order to repay you, and all your kindness.

Now with a new member to your party you you can take more quests on in the guild.