Trike Bone Costume

The Trike Bone Costume is dropped by s during the ARK: Fear Evolved and ARK: Fear Evolved 2 event or crafted in a during the ARK: ARKaeology event. It can be applied to a tamed Trike to make it look like a skeleton.

Obtaining
During Fear Evolved, s will randomly spawn around the island. They spawn very rarely, similar to Alpha Predators. Killing and looting one of these creatures will yield a Trike Bone Costume The Skeletal Trike's inventory must be looted by hand in order to get the costume. If you or your mount harvest the corpse, the costume will be lost.

The Trike Bone Costume can also be used to summon s.

This skin can be unlocked by completing the Veteran Explorer Achievement, after which it will be available in your inventory whenever you respawn.