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.)

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

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.

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

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.