Bronto Bone Costume

The Bronto Bone Costume is dropped by skeletal 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 Bronto to make it look like a skeleton.

Obtaining
During Fear Evolved, Skeletal Bronto will randomly spawn around the island. They spawn very rarely, similar to Alpha Predators. Killing and looting one of these creatures will yield a Bronto Bone Costume The Skeletal Bronto'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 Bronto Bone Costume can also be used to summon s.

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