Seeds of the World Tree

Seeds of the World Tree is a World Item that existed in YGGDRASIL.

Description
Like any other World Items out there from YGGDRASIL, it can be found and acquired by players in the game.

Abilities
Suzuki Satoru speculate that maybe this World Item could somehow allow even the undead to freely change their race without problem.

Trivia

 * This is considered as the first World Item to have been mentioned in the Overlord Bonus Volume.