Great! I went looking for "something missing" for quite a bit, but picking up the rune and dropping it again made the game progress. All in all, a game with a very nice feel.
Viewing post in YOU ARE YGGDRASIL jam comments
Oops! If you tried to get the dialogue multiple times it would've went on to tell you "someone" is missing, you have to use the correct doll to make the sacrifice. Thanks for the feedback!
Edit: Redid the tips to say "Someone is missing" the first time to avoid confusion, this and more fixes coming after the jam concludes!