Auron Tenebrae was a leader of the Necromancer Temple. He had two Clerics with him at all times; Cleric Quiver and Cleric Craven. He was skeptical of Valkyrie Cain being the Death Bringer. He had such little patience because he believed that Lord Vile would return to punish the Necromancers and wished to find the Death Bringer before that happened.
Tenebrae was studying in a Necromancer Temple in Prussia, and was one of the few survivors of a raid by Mevolent's men. The surviving Necromancers teamed up with Skulduggery and his men (notably, along with Morwenna Crow) in order to track the raiding party. During the battle with the raiding party, Tenebrae was injured and just as he was about to be killed by an assailant named Jeremy, Skulduggery grabbed Tenebrae's dagger and killed Jeremy with shadows. Tenebrae saw amazing potential in Skulduggery, who had shown this instant grasp of Necromancer magic.
Later on, his Temple was surrounded by Nefarian Serpine and his men. Tenebrae was chosen to give Serpine the power in his red right hand; the power to give agonizing death. While Serpine was being taught, he made it clear how much he wished to kill Skulduggery. Tenebrae, wishing to protect Skulduggery, in whom he saw so much potential, altered his teaching so that if Serpine ever used it on Skulduggery, the dead man's soul would remain.
Tenebrae orders Wreath to use the Remnant in the Soul Catcher to possess the SensitiveFinbar Wrong to see if Valkyrie is the Death Bringer. Auron is present at the first meeting to decide the whereabouts and members of the new Council of Elders, but is absent at the second meeting and isn't seen again until the end of the book when Skulduggery threatens Tenebrae to tell the truth about what happened to the Remnant in the Soul Catcher, but Auron refuses to give any information.