Lockseeds

Lockseeds are mysterious devices that are the source of the Kamen Riders' powers. They all have powers associated with fruits, seeds, berries, and nuts. Lockseeds can grow on trees in the Helheim Forest, assuming the shape of a flower first.

The Inves love Lockseed flowers, regarding them as their favorite food. However, if a Feudalite consumes a mature Lockseed, it assumes its Advanced State, and if it consumes yet another mature Lockseed, then that Inves will evolve into its Strengthened Form.

In Inves Games, people use mature Lockseeds to summon Inves to do battle. When a person wearing a Sengoku/Genesis Driver picks Lockseed flowers, they will quickly turn into mature Lockseeds. When a Inves Game starts, the Lockseeds say "Battle, Start!". After a Inves Game, these Lockseeds say "You Win" or "You Lose" depending on the result of the battle. After a victory, the toy Lockseed says "Rank Up!", which has yet to be used in the show.

In the Hyper Battle DVD, the Riders' Lockseeds become rusted, preventing transformations and Inves summoning, however there are ways to to restore them, according to Faye.

If an Kamen Rider summons a Inves in a battle, then they will be fully materialized in the real world, however if an New Generation Rider summons a Inves, one Lockseed can call in three at a time. If one manages to jailbreak a Lockseed (though Scott had to show how to do so), they can summon fully materialized Inves as well without being an Kamen Rider, although there is a chance for the Lockseed to malfunction.