In the land of blood and betrayal, a monster awakens with a mind sharper than Valyrian steel. Feared across Westeros as the Mountain, Ser Gregor Clegane is known for his unmatched strength, and unmatched cruelty. But when a brilliant mind from another world transmigrates in his brutal body, everything changes. Armed with the knowledge of science, engineering, and modern warfare, the new Gregor sets out to defy his monstrous legacy and carve a new destiny, not through blind slaughter, but with vision, strategy, and unstoppable force. From reforging his household and training elite cavalry units to inventing military technology unseen in the Seven Kingdoms, the Mountain is no longer just a weapon, he's a rising power. Even the calculating Tywin Lannister begins to take notice. But in a world where power is everything, and loyalty is bought with blood, can a reborn monster truly become a legend? He was meant to be a beast. Now, he might just be the future of Westeros.

After being framed for a crime he didn't commit he is sent to a high security prison while there he is given the powers of Mori Jin or known as the monkey he is later given the chance to participate in the new God Of Highschool tournament. My first fanfic I will prob need help and please gIve feedback. I don't own god of highschool or my hero academia this story is also from my phone.