Void Whale

A Void Whale is a gargantuan alien animal originally born in the currents of the Immaterium that also exists in the vacuum of open space. Nearly twelve thousand Terran miles long, these Warp-spawned entities are so large that their bodies become home to their own ecosystems made up of various other insidious creatures.

Void Whales tend to swim across the blackness of space, sometimes also navigating the unnatural tides of the Warp.

In 877.M41, a hideously mutated Void Whale emerged from the Warp and was destroyed by a team of Space Wolves led by Engir Krakendoom. They landed on the Void Whale and their way through the hideous Remora that called it home. Engir and his Astartes planted thermal charges deep within the creature's vital organs and escaped before it exploded. The Perillian Gas Belt was born out of its remains.