So my team easily cut down filge. They went in through the second floor winow after casing the Observatory to see what time Filge went to bed .They waited until he came down the stairs for bed after work. They hid, he rolled an 8 for his spot. One character threw a thunderstone, it went off, he failed the save. So now he is deafened. The next person up is the kobold cleric who throws a tangle foot bag, which hits and he fails the save. Then came the wizard who color sprayed him, and he failed his save.
So Filge is stunned, deaf, blind and a pretty gooey. His AC is now 3. One character shoots him in the shoulder with a heavy crossbow, while the cleric summons a monkey. The monkey jumps on Filge and proceeds to beat him about the head.
So we have a stunned,deaf, blind, gooey wizard with one crossbow bolt in his left shoulder and a monkey literally on his back thumping on his skull.
I explained to the group that Filge was shrieking like a little girl, whirling his arm like a windmill, with a monkey biting him in the head.
Then the fighter takes Kullen's battle axe and beheads Filge in one hit.
It could only be better if they lit him on fire while they were at it.
The missed out on a lot of information than if they had interrogated him, but the imagery was classic.