Hippophobos was supposedly a unicorn colossus that resided on Gielinor at some point. It is only described in the Colossi & the time of colossi written by Reldo. Hippophobos is there described as a beast worshipped by a cult similar to Loarnab, but the book is the only source describing it.
- Hippophobos translate to horse's terror or refused by horse in ancient Greek.
- It is also the name of an unknown psychoactive plant described by Pliny the Elder. It is thought that it may be the fungus Panaeolus subbalteatus.