Thanatos Tower is one of the towers the party must conquer during the Snow Queen Quest, governed by Yuriko Yamamoto. It is the most difficult tower, with the most powerful enemies. In addition, if a party member dies in combat, their Persona gets sealed away in Tartarus, on the second floor. The time to complete the tower is 3 hours. If this tower is conquered second or third, the party receives one Ambrosia, but if it is conquered first they receive three.