Hi! Thanks so much for your patience in playing our rough little game :) Once you have all three true sights, you have access to both endings.
One involves activating the Rune of Severance. There are two "pressure plates" in the severance room, one on either side of the door into the rotating room. You'll need to find a way to depress both plates at the same time and then stand on the severance rune.
The other ending is far more complicated. I'll clarify the goal but leave you to determine the method. You're trying to determine an order in which to step on 5 of the 6 runes around the level. In order to do this, you'll need a way to associate the runes with a number. One final hint to push you in the right direction: Renna tells you that you need to look to the stars and the tower rotation to banish the Emissary for good. You'll also need one other element. Have you looked closely at the readables? Is there anything in them that you've seen elsewhere?
Hope this helps! If you need assistance while you're playing, feel free to DM me (Discrete Infinity) on Discord. You should be able to find me in the Stand Off Software server.
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Thanks for the help! I managed to get the second ending with the god banished. It's a really good puzzle! It may have been a little easier if Renna had mentioned that you need to step on the runes in order, that was the missing piece for me. Really cool game! I might come back later and try for the other ending. :)