Hannag has warned us not to come any closer. It seems that the situation has been resolved. The Magisters have rewarded us for assisting them. We agreed to help the Magisters put a stop to the Sourcerer. We ought to consider helping either Hannag or the Magisters. We have come across a powerful Sourcerer called Hannag who is surrounded by attacking Magisters.

She can teach you source, in exchange, you need to complete quest On the Ropes.Join the fight and help Hannag against the magisters.You can acquire this quest In a ruin near Cloisterwood waypoint.Window of Opportunity is a side-quest in Divinity: Original Sin 2.