"Episode 47 - The Red Crack, Satisfaction, and Eiji's Vessel
Dr. Maki wants Ankh to go berserk to end the world so plans to insert Core Medals inside Ankh. Eiji breaks Cores and try to prevent the devouring of humans. But Maki wants Eiji to go berserk as well and inserts Medals inside him as well. When Maki prepares the final act, Ankh intervenes, but because of that his Core Medals are taken away, which is a threat to his existence. The injured and exhausted Eiji is found by Satonaka, she takes him to Kougami Foundation. Eiji develops a desire with power and Kougami prepares a lot of Cell Medals in front of him.
On the other hand, Hina tells Chiyoko about the relationship between Eiji, Ankh and Shingo. Chiyoko accepts the facts and encourages Hina. And because of that Hina decides to...?
Episode 48 - Kamen Rider OOO's Final Episode
Uva regains all 9 of his Core Medals and is complete, the process of ending the world is starting. Maki wants Uva to go berserk and keeps on inserting Core Medals inside him. Uva gets annoyed and escape. Birth fights with the Complete Uva. Eiji without any Medals, asks Kougami for help. Kougami hands Eiji the power to save the world, the King's Core Medals (王が持っていたコアメダル). OOO appears in front of Birth, together with Ankh, they fight Uva. But Ankh does not tell the others that his Core Medals are slowly breaking..."
I wonder what the King's Core Medals are? Some speculate a stronger TaToBa Combo or even BraKaWani Combo.