existieres

form-of future second-person singular subjunctive

existirの第二人称単数未来接続法

English Meaning

second-person singular future subjunctive of existir

Si existieres en un mundo paralelo, descubrirás secretos que podrían cambiar tu destino.

もし並行世界に存在するならば、あなたの運命を変える秘密を見つけるでしょう。

If you were to exist in a parallel world, you would discover secrets that could change your destiny.