This deal keeps getting worse and worse, but he really doesn't want to die, and even a few hours might buy time for other groups of cultists and demons to counterattack and free him.
"I know what the plans for the Wardstone are and their overall effect. Big picture stuff, but really important! I... I mostly know cultists from this cell, but I can match a few faces and a name or two from outside of it. And I don't think everyone was with us, so that is a few more names. I've heard lots of rumors and hearsay, and I know that isn't the most valuable but you're an intelligence expert, right?"
He wracks his brain for more...
"I know about some ongoing plots tied to these caverns. And a few people you could rescue right now! Not exactly innocent, maybe as innocent as your average tiefling, but you know? Uh..."
That is actually a lot of information, he should demand more in return.
"And about your deal, just because the Paladin says so, how do I know she-" head nod at Darth Occlus "-won't get impatient with you all dragging me around and decide to speed things along?"
His voice has gotten more confident as he has decided that actually he has quite a bit of useful information.