Below is a walkthrough for the Inner Daemons side quest in Tiny Tina’s Wonderlands. You’ll automatically obtain this quest after completing the Lyre and Brimstone side quest.
Go to Brighthoof
Fast travel to Brighthoof and head to the object in the southeastern part of the area.
Talk to Zygaxis
Speak with the Imp.
Open the gate
Approach the gate and press square then quickly back up to avoid the trap.
Choose a sin: Con 3 townsfolk out of money or cut in line
We chose to knock on the 3 nearby doors marked by the objectives to con the townsfolk out of money. At the third door, an enemy will come out. Defeat him!
Chose a sin: Deface 3 buildings or play a prank
We chose to play a prank! If you play a prank, head to Izzy’s Frizzies then place a whoopy cushion on Ferdinand’s seat.
Choose a sin below: Kill annoying lovers or don’t keep off the grass
We chose the most despicable of the 2… don’t keep off the grass! 😀
Talk to Zygaxis
Speak with the Imp.
Melee gate
Approach the gate and melee it.
Explore alley
As you approach the locked door with a hidden switch, you’ll be tasked with opening it. Pull the lever on the ground a short ways in front of the door.
Search catacombs
Follow the path to reach a practice session.
Kill everything
Defeat all the enemies!
Pick up Shadeborne Grimoire
Pick up the item dropped by the enemies.
Find host for Zygaxis
Speak with a prisoner to complete the quest.