Battlemage in danmachi (droped)

In this story the mc will be a s killed warrior who has great skip in magic and when he comes to orario he will be 20 also he will be part of posideins familiar and I'm making posiden a goddess because in the original myths hepestus and loki were hods not godesses so if the creators can gender end as o can I and I know this isn't much of a synopsis you will learn more as you read there also will be a info dump as a auxiliary chap tho I hope you enjoy the book