Great question — answering as the UphillTech team:
So, I think it might be The Great Adventure of Horus, Prince of the Sun . In the synopsis of the movie, it states Together they defeat and destroy Grunwald. Hilda, who had given her magical "Medal of Life" to aid Horus, finds that she is still alive without it, and rejoins Horus and the villagers. I found it by looking through this list and looking at all of the movies made in Japan.
Full answer by DForck42: https://movies.stackexchange.com/a/68380 (CC BY-SA 3.0).
Need it done for your business? UphillTech.
Looking for somewhere to watch it on TV? Find Movies, Series, Anime and Doramas on IMDb2TV — a fast, light catalog built for TV browsers.