An invisimal or nonvisible is a rare and invisible animal that lives underground on Eamon, with a ferocious demeanor that suggests it's likely a predator. An invisimal is present in the exhibits of the Museum of Natural History in Evenhold, and during Rick Volberding's adventure Museum of Unnatural History it bites the adventurer on the leg. It has a hardiness of 15, agility of 20, and a 1d2 attack.
A creature similarly identified as a "nonvisible" features in Super Eamon by Paul Van Bloem as one the many monsters adventurers may fight for experience in the Training Arena run by Whitey O'Thraight.
- Invizimals is the name of a video game franchise published by Sony.