There's no indication in this fight precisely because neither Emilie nor the MC know this enemy and its strength, but the previous fights are tutorials to help you understand this one (the duel in the village teaches you that sometimes it's not enough to spam block + revenge but that you have to block at the right moment, and the fight against the Elite enemy teaches you that the tank's role is to taunt the opponent in order to protect Emilie). And no, Emilie doesn't have magic, she plays a pugilist class, as she said before their first game session. I'm sorry if this part was difficult for you, but failure here doesn't block progress (but it does unlock an extra h-scene).
I wish you a speedy recovery, and I'm glad you enjoyed the rest of the update

.