Rescue Souls in the Maw.
Souls continue to pour into the Maw. Their anima, our very lifeblood of the Shadowlands, is going with those souls to fuel the Jailer. You rescued me from the Maw. I see no reason you cannot pull more souls from that abyss. Bring souls you rescue from the Maw to me and I shall see them put to better use. At least in Revendreth they have a chance of redemption.