not having much trouble with this boss.... got rocfeather robes+ (spirit/wind) for my main character. So I'm doing about 600 damage per hit.... the level 100+ friends I have help a lot though

My character is at level 40. I'm going to beat level 15 today, with the help of some gems perhaps. There's no way i'm making it to lv43.

What level do you think is required to beat level 15?