I think the issue is that the ritual spell never showed up in my spell list even though the game told me I learned it. Either way, I finished the game last week and it was a lot of fun!
Viewing post in Caliross, The Shapeshifter's Legacy comments
Equipment doesn't appear in your regular inventory, but it should appear in the "charms" sub-section. Anyway, if you did everything right you should be able to equip it in the "accessory" section of your equipment page. If you checked already, maybe send me a link to your savefile, and I can try to figure out what went wrong.