Xe'ra has not used any light based magic that we know of.
I find it extremely suspicious that her contacting the player characters mind causes intense pain when EVERY other Naaru has communicated in a way that is 'soothing' and makes the character feel at peace. No other Naaru has used audible Language either (that I know of), they just communicate telepathically with the chimes.
It also has a gender in a way most Naaru don't seem to, they seemed to not have a gender before this point, since they were spawned at the dawn of the universe and don't reproduce as far as we know.
It talks in a way that is condescending and generally makes the player feel bad about themselves - again something no other Naaru encountered has done. End justifies the means seems like a strange position to take for beings that are supposed to be supremely altruistic.
I don't trust it. I think it's a disgrace to the Naaru.