First, you have to find 4 pieces of a broken amulet.
First piece (here) under the loose board north of the bench west of Darashia dp .
Second piece (here) in the Dark Pyramid single coffin 3 stairs down, to the left of the stairs leading down to the Mummy and the Stealth Ring Quest.
Third piece (here) close to the bottom right corner in the sand, at the Ancient Ruins Tomb north of Ankrahmun (you dont need to dig for it, just use the sand)
Fourth piece (here) in the single vampire spawn, at Drefia in the bottom left coffin.
After you have found all four pieces, go to A Sweaty Cyclops in Ab'Dendriel (here) and ask about an Amulet, pay him 5,000 gp, wait 24 hours, and ask about the amulet again. You will then receive Koshei's Ancient Amulet.
You need to light the torches of the two marked statues (and turn off the other torches) to open the hidden entrance by using the sundial right in front of the stairs. The torches of the other 3 statues should not be lit. "Use" the sundial and you hear a "Click" sound south-west. Go down through the hole in the coffin in that room.
Follow the route marked on this picture. You will meet 4 Ghouls, 1 Skeleton, 2 Crypt Shambler on the way. Walk inside the room in the north part of map number 4 (past the 40 level experience gate) and Koshei the Deathless will spawn. He will only spawn if you have Koshei's Ancient Amulet in your inventory. A Bonebeast will also spawn. After you have killed Koshei the Deathless, use the amulet on his corpse and go to the quest door a little to the south-west (star on map 4) 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.
2nd floor: 3 Crypt Shambler
It is strongly recommended to be minimum 2 level 40 players with skills (60/60). Although a level 60 knight with skills 80/80 can easily solo him.
After waiting 24 hours
See also:Tibia Tales