Arueshalae is one of the most interesting companions in the game. Here's how you can recruit here.
Pathfinder: Wrath of the Righteous – How to recruit Arueshalae early
A succubus who transcended her demonic nature, Arueshalae makes an interesting addition to your companion. There are two ways to recruit her – one in Act II and the other in Act III. But the first option will have some prerequisites…
The first option to recruit Arueshalae will only be available if you have done some specific things beforehand. First you need to have the Azata Mythic Path unlocked. For that, you need to complete the Starward Gaze quest in Act I.
If you have decided to spare Ramien, who is in front of the Temple of Desna, you will trigger the Starward Gaze sidequest, received from Ilkes. In it you need to find two Desnan adepts – Aranka and Thall the Wallflower.
