Osmos's keys

Osmos was the most powerful key forger in all Telluric history, crafting and veiling the four kingdoms in a Telluric Realm; adapting warrior bloodlines so they could shift into dragons and take to the sky; and for crafting the Osmos devil, a key that prolonged life. It could not stop death, but slowed the aging process to five years for every hundred.

It is believed Osmos even found a way to bring back someone to life and possibly to stop death, however, he decreed these forgings as against nature. His diary contains the details of the knots needed for the keys but Osmos’s dying curse was that as long as winter survived, no one would be able to read them.