Somebody correct me if I remember that incorrectly, but: I have purposefully tried to use [ILLITHID][WISDOM] as much as possible and after the last dream (after which e.g. Lae'zel and others VERY strongly reprimand you for that) I abused it again - I got a kind of "now there is no coming back" dialogue from the Narrator. I also think that after that, I got [TRUE SOUL] options instead of [ILLITHID][WISDOM], but that might very well coincide with receiving the branding (not sure).
It seems rather obvious that there will be SEVERE consequences for abusing the powers too much.
But back to the OP: Yeah, the ring should actually work, not just block the powers in combat.
