Yen Sid admits that Cosmos and Aqua may possibly be the two co-leaders of Warriors Of Cosmic Light, which consist of Seekers Of Light and Warriors Of Cosmos to fight eternal chaos and darkness. He will wait for Sora, Warrior Of Light and the many heroes and Warriors of Cosmos and Materia. to come for him.
In later arc, Yen Sid sees Yeul that she will predict that time will change chaotically, it's up to Fulmen, Lumina, Umbrae, Sanguia and Tempus.
Here, Palom, Porom and Leonora along with 3 Fairy Godmothers Flora, Fauna and Merryweather, and a Cinderella's Fairy Godmother assist and help Yen Sid find the secret. Yen Sid also gives Fulmen and Lumina his advice to them. He tells them to find Fragments of the Celestial Realm.
Sometimes, Five leaders of Dawn like Aced, Ava have a meeting with Yen Sid. Also with Imperius, Tyrael and Aruriel.
- "Reinhardt, I want you to protect the Mysterious Tower while I am away along with sage Leonora."
- "Fulmen and Lumina, two Keyblade Masters, make sure that three keyblade warriors stick to you."
- "Do not be rash, Imperius."
- "Materia and Cosmos, always be with your warriors."
- "Lumina, students must be with you should they fail."