Koshei the Deathless Quest/Spoiler

Required Equipment

 * Rope

Method
First, you have to find 4 pieces of a broken amulet.

First piece(here) under the loose board north of the bench. Second piece(here) in the single coffin, to the left of the stairs leading up to the mummy and the Stealth Ring Quest. Third piece (here) close to the bottom right corner in the sand. Fourth piece(here) in the single vampire spawn, in the bottom left coffin.

After you have found all four pieces, go to A Sweaty Cyclops in Ab'Dendriel and ask about an Amulet, pay him 5000 gp, wait 24 hours, and ask about the amulet again.

You can either keep the amulet, or take the amulet and go to the catacombs in Darashia and go (here):

You need to light the torches of the two marked statues to open the hidden entrance by using the sundial right in front of the stairs. Follow the route marked on this picture. Walk inside the room on the map number 4 (past the 40 level experience gate) and Koshei the Deathless will spawn. After you have killed him use the amulet on his corpse and go to the quest door a little to the south and claim your prize.

'''Warning!! If you leave the room where he spawns, he will disappear, and once you enter the chamber again, he will respawn with full health!!'''

If you do not IMMEDIATELY use the amulet on his body, he WILL respawn.

The treasure chest is back past the experience door and to the left.