T'rolbarahl were demonic creatures created by Dessimbelackis during the First Empire long before his association with the Deragoth. He later ordered them exterminated, concluding that their creation had been a mistake as he was unable to control them.
In The Bonehunters
Realising that they were being hunted to extermination, seven remaining T'rolbarahl imparted part of their souls into the unborn child of a human woman creating a M’ena Mahybe, for a seven-faced D’ivers T’rolbarahl child. On the night that the T'lan Imass attacked the First Empire, the child, Dejim Nebrahl, was born. It escaped the slaughter but was later captured by the Deragoth who at the time obeyed an unnamed 'clever master'.
- "The T’rolbarahl were [...] the culmination of truly human traits, blended with the strength of beasts. Savagery, the inclination towards vicious cruelty, the cunning of a predator that draws no boundaries and would sooner destroy one of its own kind than another. Feeding the spirit on the torn flesh of children. That stunning exercise of intelligence that could justify any action, no matter how abhorrent."
- ―Dejim Nebrahl