Thanatos used to be known as Tharkos and was the capital of the Minotaur kingdom of Minostal. After Stamatis Zotikos murdered Eukleides Niklaos, Kuyutha, the Exarch of Bahamut, brought his master’s wrath down upon the city. The survivors fled, never to return. The city’s ruin was made even more complete during The Rending.
Over time, Undead rose from the violence that Zotikos’ followers had perpetrated. Now Tharkos is known as Thanatos, and it is ruled only by the dead.