The exploration of subterranean rakghoul tunnels by THORN personnel has led to many chilling revelations about rakghoul biology and behavior--none more horrifying than the gargantuan creature known as "the Eyeless". Far larger than any rakghoul ever previously recorded, these creatures make their home near the very heart of the outbreak. Sensor probes and scouts have never found more than one such creature in each tunnel network.
No two THORN scientists can seem to agree on the role of the Eyeless in the rakghoul heirarchy. Some theorize that they are actually the source of the outbreaks, where others believe them to be a mere byproduct of the plague's progression. Until more detailed scans are made available, definitive answers on the nature of the Eyeless will likely remain out of reach.