| 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 prior to the renowned Abyssal Release (7777 DE - 8777 DE), Sess'innek was one of the numerous broods of Semuanya dispersed across a dozen realms.
When Sess'innek's home world of Kraa'tzor suffered corruption from the Threads of Damnation, he, like many others, was transformed by the changes sweeping the world. By the second year of the Abyssal Release, he had become a demoniac Graagvrii - a demon, tied to the Abyss, who gained power through guile, wit, brutality, and sheer force. By the war's end, Sess'innek had progressed through all the Demon Stages, ascending to the rank of Demon Lord.
Sess'innek is an accomplished assassin. His initial mentor perished in a gaming mishap, while his subsequent leaders met mysterious fates, including drowning and demon conflicts, until Sess'innek personally bested his final master amidst infernal power struggles. Sess'innek then assumed his former leader's dominion over Kraa'tzor, a realm long contested within the Abyssal Release.
In the year 91 GE, two years into the Demon Spawn War (89 GE - 269 GE), Sess'innek invaded the Chen'gom Sector of Bal-Kriav. On the lands now known as the Troll Bogs, Sess'innek engaged in battle against the Covenant armies of Semuanya.