Skulls of Skullport

In the chaotic underground of Skullport, a city of thieves, murderers and slave traders, the Skulls impose some semblance of order when things get out of hand. They are magically powerful floating skulls believed to be the spiritual embodiment of the arcanists who created the Mythallar. The Mythallar or mantle is a sentient and powerful arcane relic capable of generating nearly limitless power. The Mythallar in Skullport was created to support the immense weight of the world surrounding it, but at some point it seems that the magic had faltered, and Skullport was in danger of complete destruction. Only through the efforts of the arcanists did the caverns survive but at the cost of their own lives. They were reborn shortly after as the Skulls, guardians of the mantle.