Prehistoric Farm: get the Bonebound Key and summon Raptor X

Evergreen guide. Researched: October 15, 2026 (UTC).

Quick answer

Earn the Bonebound Key by completing Dr. Ivy's three quests on Blackgate Isle. It lets you summon Raptor X: the key is permanent, but has a five-minute cooldown between uses.

Requirements

The hand-in list is 5 Raptor X Remnants, 5 Lock Fragments, 3 Velociraptors and 1 Albino Rex. Check the active objective before handing over materials or animals.

Step-by-step route

1. Find Blackgate Isle between Cambrian and Devonian, using the islands as landmarks rather than relying only on the compass. Talk to Dr. Ivy beside the fence.
2. Complete the first task by collecting five Raptor X Remnants through fishing.
3. For the second task, obtain five Lock Fragments by defeating Mosasaurus. These are lock fragments, not fishing Remnants.
4. Gather the final tribute: three Velociraptors and one Albino Rex. The documented route for Albino Rex uses fusion of an adult Tyrannosaurus rex and adult Velociraptor on Cretaceous.
5. Return to Dr. Ivy on Blackgate and check which dinosaurs you are handing over: the quest takes them in exchange for the key.
6. With the key, interact with the box to the left of the Blackgate building to summon Raptor X.

Mistakes and success check

Do not repeat the whole questline for each fight: the key remains. If the summoner does not respond after use, check its cooldown before looking for another key. Success means owning the Bonebound Key and activating the encounter; random boss rewards are resolved separately and are not guaranteed here.

Checklist: quest accepted on Blackgate; five Remnants; five Lock Fragments; dinosaur tribute checked; key received; summoner and cooldown checked.

Related reading: feed dinosaurs that still need to grow.