Trickery

Very little is known about Trickery except that they existed when Tsunamjin first cast the Hunger into the Abyss, as they helped negotiate a deal with the Nine Hells to keep it guarded. They are thought to be a tiefling. They are also thought to still be alive today, given their soul still hasn't been collected by one of the many, many fiends they have struck deals with.
Zeal has revealed that Trickery is one of the most coveted souls in the Nine Hells due to eluding so many devils, both despised and respected. His name is often used as a curse or insult, i.e. "That's as good as a deal with Trickery."
There is a building called The Tower of Trickery in the Lotus Rose district that seems to be a portal dimension mega-dungeon filled with impossible environments and fantastic monsters. Many fiends believe that Trickery himself is hiding inside and if one can make it to the top and kill him, his soul could finally be claimed. As of yet however, no-one has made it to the top of the tower.

The Tower of Trickery