Fight them until the light moves, then follow it over to the chest and finish off the Rogues there. When you get close to the chest, two Rogues attack. Along the way there are a plethora of poison tiles on the floor that stand out just enough to avoid them. You need to follow the light to a chest that contains a Poison Resistance Shard. Equip light armor and head into the portal. Make your way back to the area just outside of the graveyard to find that the portal there is now open. Head back to the square where you fought the Beast and look around the red smoke near the big doors to find a Planetarium piece quest item. Inside you'll find three audio notes and a chest that contains Persistence head armor (one of the best head pieces in the game), an Empty Bottle, and a Poison Resistance Shard. Return to Prima's Lords of the Fallen walkthrough! Go back to the arena where you fought the Champion to find that the cage (shown in the cinematic before the boss battle) is now open.
