Ulfang Tower

This is a high level dungeon in the far north reaches of Falothes, and stronghold of an archaic lich named Ulfang. The tower has 10 levels with roughly 10 encounters (1 puzzle, 2 traps, and 7 fights) per floor that rise in difficulty and CR. the ground floor is level 5 and the top floor is level 15. exiting the tower will respawn cleared floors. The dungeon features primarily arctic and undead enemies. All the monsters in the tower are unaligned, including Ulfang himself, and will never leave the Tower and will not attack unless attacked or if the players try to move into the next room.