Arena Sub-Level is a location in Pillars of Eternity 2.
Notes & Tips
Arena Sub-Level is filled with skeletons, wisps and constructs. If you find them to hard to handle, you can use the gunpowder barrel to wipe them out. (by luring them to gunpowder then light them up. Just be careful dont stand too close to the barrels.)
Oderisi's remain's can be found in front of the Pillar of Adra.
There is a room called Trial of Flame, to put out fire, you need to activate three sigils on the ground that matched the shields in previous room. (the correct sigils are top-left, top-right and bottom-left)