| Category | Heroes |
| World | Kraa'tzor |
| Race | Demon (Demon Lord) |
| Gender | male |
| Alignment | chaotic evil |
| Deity | none |
| Birthplace | |
| Born | 4 Warper 7762 DE |
Born fifteen years before what would become known as the Abyssal Release (7777 DE - 8777 DE), Sess'innek was one of Semuanya's many clutches scattered across a dozen worlds.
When Sess'innek's home world of Kraa'tzor suffered corruption from the Threads of Damnation, he like so many others, changed with the world around him. By the second year of the Abyssal Release, he had become a demoniac Graagvrii. A demon, tied to the Abyss, he gained power by guile, wit, brutality and sheer power. By war's end, Sess'innek had made it through all the Demon Stages, becoming a Demon Lord.
Sess'innek is a skillful assassin. His first master was killed in a gaming accident, his next mysteriously drowned, and so it continued through five more leaders, two of them Demon Lords. Only in the last did the slayer show his hand, with Sess'innek personally defeating his master in the midst of demon in-fighting. Sess'innek took his master's claim over Kraa'tzor; a world much fought over in the Abyssal Release.
In 91 GE, two years into the Demon Spawn War (89 GE - 269 GE), Sess'innek invaded Bal-Kriav's Chen'gom Sector. In lands known today as the Troll Bogs, Sess'innek battled the Covenant armies of Semuanya.