| Category | Heroes |
| World | Kraa'tzor |
| Race | Demon (Demon Lord) |
| Gender | male |
| Alignment | chaotic evil |
| Deity | none |
| Birthplace | |
| Born | 4 Dreamer 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 the systems and worlds. Sess'innek was born on Kraa'tzor, one of the worlds of Piranoths Steps. When this world and others were corrupted by the Threads of Damnation, so started the demon war against the Primordials, the Abyssal Release. Sess'innek was one of those that went through the natural conversion brought on by the Threads of Damnation. By the second year of the Abyssal Release, he had full converted, becoming a Half-Demon Graagvrii. Like other demons, 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 the Demon Spawn War (8972 GE - 9493 GE), Sess'innek's was part of the Abyssal Hegemony. His forces captured sector Chen'gom, and battled those under Semuanya. Sess'innek was jealous of his opposite. This came from Semuanya's powers as a Creationist; powers that no demon then and now is capable of wielding. As a result, Sess'innek put his brightest to work creating things with Abyssal Infusion. The Scrag race are perhaps the most notable products of these grisly experiments.