As part of PAX's research, a sample of creep was brought to the facility by the zealots Akam, Golarath and Ruom, who were also assigned to guard the facility in the event of an accident. As it was, an accident did occur, Golarath and Ruom went to extract a tissue sample. As it grew, Golarath began disfiguring himself, eventually falling to his own psi-blades, while Ruom fell into catatonia, his mind unreadable.
Things became worse as a chain reaction ripped through PAX, destroying its stargate and thus cutting it off from the rest of protoss civilization. Akam suspected sabotage, while the rest of the scientists sensed great anguish in the thoughts of the scientist Wa'Rak. They found him in his quarters, having commited suicide in a manner similar to Golarath. To make matters worse, Ruom reappeared, having become infested. Akam and the scientists Jhas and Forthum were killed in seconds and Harrum wounded. However, his fellow scientist Gruu managed to activate the teleportation in Ruom's power suit, buying them some time. However, as they went on, Harrum's mind became clouded with horrific images, courtesy of the creep's virus-induced psionic powers. He eventually fell to the mental assault, falling to a returned Ruom's physical assault seconds later.