Prince Parni deSangre was the son of Castomira Brangwin and Prince Mycale deSangre of Seleucar. Castomira intended to use make use of his royal blood to gain control over the Staff of Nicator. After his mother's defeat and death, the boy was adopted and raised by his aunt, Catarin deSangre, who gave him the proper upbringing of a possible heir to the throne. The queen hid his Tsol'teth ancestry and the evil intentions of his birth mother from him as best she could. Parni is said to have grown up moody and rebellious but not at all cruel or hateful.
Parni later disappeared mysteriously during a hunting trip, his companions found gruesomely dismembered in the woods. It is unknown what exactly happened that night, but historians say that he made a dramatic emergence centuries later, an appearance which spelled the doom of the Seleucarian Empire.
In the year 725 AF it was revealed that Parni had been living under the assumed identity of a solitary Tsol'teth named Tenith'oru, his only company that of his human protege, the Child Sorceress Kosuira. When his protege was taken from him by the Tsol'teth he did his best to reclaim her, albeit his efforts were hampered by his hesitation to reveal his true identity. He would eventually reclaim his birthright, the Staff of Nicator, and destroy her captor, the Tsol'teth Agith'tai, named the Blue Fang. Unfortunately, having arrived far too late, Kosuira's injuries would claim her shortly afterwards, and though in his grief and madness he would try to bring her back to life by powering a spell with the countless Achaeans beholding the scene, he would ultimately fail. In revenge, he would then teach Sapience as a whole the arts of the Depthswalkers.