continuing my Xalatath\Locus ex-partnership headcanons i'm gonna refer to Locus-walker as Locus cause it simpler ok?ok.

Alleria was constantly moody with Locus Walker throughout the story and in the end severed her ties with him, denouncing him as an ally, teacher and friend. Now one thing that struck me was when she said he's not longer her friend, Locus Walker tries reaching out and very mournfully calls out her. The reason I found this moment meaningful is cause he's a Void Etherial, essentially a being infused and made up of Void, and one known characteristic of the Void is that it doesn't understand the bonds between mortals, and it will do everything in its power to make the user cut and sever their ties with their loved ones.

If my memory serves correct, Locus Walker himself even used to tell Alleria how her connection to her family holds her from unlocking her true potential and how she needs to let go of them back when he was still her fresh teacher. So to now hear him sound rather heartbroken and mournful over her ending their bond really shows how fond he had grown of her and that even an individual so connected to the Void, isn't immune to the emotions that can blossom between people.