Core Medal

The colorful Core Medals are the O Medals that allow Kamen Rider OOO to transform and change between his various Combos. These five types of Core Medals were originally fifty created by human scientists 800 years ago as a means to create artificial life, drawing from characteristics of different animals, forming the core of the Greeed before one Medal in each set was destroyed. Each Greeed has a specific shade of color that their Core Medals come in: Ankh's Core Medals are red, Uva's are green, Kazari's are yellow, Mezool's are blue, and Gamel's are gray. In the beginning, after stealing some from his fellow Greeed, Ankh holds many of the Core Medals and gives them to Eiji when he wants him to fight as Kamen Rider OOO. Later, Ankh gives Eiji the Taka, Tora, and Batta Medals so he can defend himself when Ankh is not around. However, seeing Eiji's first use of the Latorartar Combo as reckless, Ankh takes the Core Medals back, stating he should have never given them to Eiji in the first place.