Rhiannon was a university student. She was part of an expedition to explore the Artifact.
She had visited the Artifact previously. On her following trip, she became infected by it. Ace was later infected, and she put Rhiannon into a temporary coma to try to reduce its influence on her. Unfortunately, she waited too long to revive Rhiannon, who died from oxygen starvation to her brain. (PROSE: Parasite)