Hi I have a level 151 bucc and I just can't kill this boss before her graphics start glitching out and then the client crashes (about 5-6 minutes in the fight) She keeps summoning these mobs who have crazy amounts of hp and my skills keep targeting the mobs instead of her making this fight go on for ever
Use the img client if you already are not doing so, it's incredibly stable though the trade off is slower loading times from what staff has mentioned. You seem high enough level to solo Ephenia if you can get through the graphical glitching. The unfortunate mob targeting is due to how ephenia's teleport is coded as a respawn and not as a teleport and AoE skills prioritize mobs based on spawn order.