Series of inputs / mini-games to do during the exorcism + different possessed things require different items to conduct the practice (some are harder to do = higher level objects needed [rarer items need to be collected after redeeming the area from mutation] high-risk high reward mechanic) When the exorcism is complete, the creature will turn cute with a cute particle effects / squeaky sound effect. The colour palette of the room and the character will change to vibrant/illuminated colours. If the harvesting path is chosen instead then the environment stays the same and the soul of the mutated creature is added to the soul pouch within the players’ inventory.
The witch always gets into a minigame fight scene with the creature to get it weakened, once it’s weakened the option to either harvest or release will appear. If harvest is chosen then an intense spell scene will be done where they will turn into a soul orb. If release appears then they gradually turn into their original form.
You have an exorcism/harvest, those are the peaks in gameplay. In between there could be mazes or puzzles, these you traverse through and act as filler to collect items for harvests. Around filler areas the steps of the initiation process are revealed bit by bit with some sort of object, stones, engravings , pages, book pieces etc. The last piece of the lost pieces says that youre harvesting witches that were banished from the coven. Their punishment for not following some sort of order was to be turned into those creatures. You would have a ‘soul pouch’ that has to be filled to a certain amount. The game starts off with it being half full already and the player is only with the protagonist during the second half of the process. You harvest the first one you encounter, a forced choice, the protagonist and player doesn’t know that it’s the bad option but it’s still there. Therefore it doesn’t impact their morality.
Bad ending would be becoming the priestess and giving in to the darkness. Good ending would be releasing the mutated witches and challenging the coven.