Naraza

Naraza was a female Nerazim protoss who studied the energies of the Void in the early days of the dark templar's exile.

She partnered up with a fellow student, a less ambitious male named Theromos, and eventually convinced him to perform a ritual that would combine the two of them into a powerful, permanent dark archon. He agreed, but was not strong enough to go through with the ritual. Naraza ignored his pleas to stop and, greedy for more power, was consumed by the Void.

This traumatic event made Theromos pledge to only teach others in the use of the Void's power, and not wield it himself. It took many centuries for him to overcome his grief and relate this story to anyone.