I've awakened the spirit of an ancient Dark Elf scribe named Mavos Siloreth. Mavos's spirit can't remember how he bound Balreth in the original ceremony. To help me, he's going to perform a ritual and show me a vision of the past.
Mavos' ritual requires two items: a skull and a candle. These items are locked in chests to the east and west. I'll need to solve a puzzle at each chest to obtain them.
— game journal
The puzzle of Mavos is fairly easy to solve, one can see the right colours on the braziers behind the puzzle braziers, whose colours have to be brought into the right order. The combinations are: Yellow-Blue-Yellow and Red-Yellow-Blue. After opening the chests, the player finds a painted skull and a Kwama-Grease Candle.