Zardnaar
Legend
If there are deities then these should teach mortals the core of civiliation. Prehistoric "deities" would be kami or nature spirits who would rather the Nature and wild life more the arts by advanced civilitations.
Instead metal it could be ivory, shells, scales and leather by the most dangerous monsters to be hunted.
Other option could be reincarnation into an animal, and later this polymorphed into a humanoid shape.
5000gp worth of tin