An Enchanter in Chains is an Act I side quest. The quest is started and completed by talking to Malo, the Apprentice Enchanter, in Slavers' Stockade after you've opened his cell.
Text
Oh, thank you so much! Here I was, afraid I'd never enchant anything ever again!
I was on my way to the Estherian Enclave when these brigands ambushed me. Once I gather my wits, I'll head over there. Come by and see me, if you get a chance!
Rewards
Gold: 0 XP: 500 Fame: 750 Item: No