If i were to be summoned to create a treasure i would take :

the hollow ,echo of a titan screech and the head of a wyvern magnificent manipulating everything in sight

A poltergeist arm toxic, ancient older than time, a rusted intricate sword that came from the Viking Ragnar once he got thrown into a pit of snakes.

A theraznosaur’s claw so sharp it’s like a razor so unbreakable its steel like witch come from the dinosaur times under a bush.

Manticore’s core poison lava-like  and toxifies anyone in a certain radios a hook of a pirate so ancient so rusted it will infect you.