noun which may take the genitive case particle 'no'
Loanword from English 'immortal', used as a no-adjective to describe something that is undying or eternal, often in fantasy, gaming, or metaphorical contexts.
彼はイモータルな存在として描かれている。
He is depicted as an immortal being.
このゲームではイモータルのキャラクターを操作
In this game, you control an immortal character.