The Frozen Tower of the Undead

From CabalWiki

Level 85

Name: Adventurer Lodging Dungeon
Location: Desert Scream

In order to complete the next step go to Undead Ground:
Frozen Tower of the Undead Entrance
To reach the tower, you must travel counter-clockwise around the entire map (turn right from the starting point) while avoiding dead ends. In order to complete the quest talk to the tower, the order of the sentences to press is: 5-2-1

In order to complete the quest go to:
Adventurer Lodging Dungeon