The Triboniophorus Tyrannus (/'traɪ,boʊniːoʊ,fɔərʌs/ /taɪ,rænʌs/ treye-boh-nee-oh-foh-russ teye-ran-uss), often referred to as the Brain Slug, is a community-created cosmetic item for the Pyro. It is a paintable green, gelatinous slug with beady gloss black eyes, placed off-center atop the Pyro's gas mask-burnished head.
- Triboniophorus is a genus of green slug native to Australia. "Tyrannus" is Latin for "tyrant/despot". The item name can thus be translated from New Latin as "the tyrant slug".
- This item appears on page 2 of the True Meaning comic, wearing a B.M.O.C.
An X-Ray of the Pyro with the Triboniophorus Tyrannus on top, as seen in BLU Alien biology lab on 2Fort Invasion map.