I am at the end of chapter 8, doing a good amount of side content before finishing the story. I am running towards a quest location and some daemons want to pick a fight with something that isn't their own size.
After a few seconds into the battle, Aranea shows up out of the blue, joins my party, and helps me fight the daemons. After the fight, Noctis thanks her and she leaves.
What prompts Aranea to randomly join my party for the fight?
Best Answer
Aranea Highwind's appearance in battles after Chapter 7 isn't triggered by any specific conditions.
Fandom states:
There is a glitch that remains in v.1.03 where you can force her into your party, at the cost of an ability to fish.