Croatoa is an Imperial Death World. Little is known about this world save that it is, in some way, itself a living being.
- Warhammer 40,000: Rulebook (5th Edition), pg. 115
- Warhammer 40,000: Rulebook (6th Edition), pg. 153
- White Dwarf 388 (UK), "Death Worlds of the Imperium," pg. 77