Evasion doesnt do jack in this fight so probably avoid dunban. Lorithia has lots of ether damage so thats something you need to deal with. Its possible to run a setup where quick meter build and revives allows you to outlast her but that can get complicated. Lorithia is not kind to those who are underleveled either. I had to be 5 levels avout just to have a close call when I did it. Theres also YT tutorials but you probs dont want spoilers. (Also you’ll pay for your insolence.)

Thanks for the help everyone! I used Riki, Melia, and Sharla, and leveled from 7 under her to 2 above her. That solved the fight

I’ve never had any issue with this boss with more ether-focused builds (melia, riki, and ether 7 are great). I didn’t even realize it was notorious for being difficult until after i had beat the game lol.

Is your level high enough? XC is not a hard game, usually it’s just a matter of having a high enough level, decent gear and a balanced team… or Shulk, Rein and Dunban

Turn the game difficulty down. Grind another 10 levels or so. The last bosses are way more difficult and this boss fight acts like a gatekeeper.