I mainly just posted this for feedback as to why it happened. I was really surprised to see this after doing 720-750 all fight long. I start the fight with Spirits within for about 800 damage which is pretty standard for my 1600 hp. If anyone has any clue how this happened I'm open to any ideas. :)
Some random nms take extra dmg from magic and even fewer mobs take extra from just non-elemental magic. Try spirits next time see if that does extra too