"Therefore I am"

Adelard, A normal boy gets framed, Abused, and hurt... The apocalypse has started, abilities were unleashed, people over 21 dies but people under 21 survive with supernatural, unearthly powers that could control fire, water, air, and water. Adelard realises that he had enough, and so when he was bleeding to death, He realised how people in this world has hurt him, and soon he would be able to control four elements and take revenge on the people who have hurt him, but they have been turned into four of the leaders of a country, the world has divided into four sections, fire, water, air, earth country, he got kidnapped by adults who want to turn them into weapons, he got out, betrayed, and met one of his bullies, Mars, they journey together, Mars want something with the four most dangerous and most powerful kids in the world, but are Adelard and Mars much more powerful.