Tomb of Luxatep Puzzle
You need to have one of your companion be a soulgem, insert it in the standing statue to take control of it, then place it on one of the pedestral.
Interact again with the statue to take back the soulgem and do insert it in the other statue an d olace it on the other pedestral (dont forget to take back the soulgem).
You can inflict soulgem on a character by using an empty soulgem on them. You can cure the soulgem status by interacting with the altar in the cathedral.