Searching for an animated movie with the following hints
- should be the same age as "the last unicorn" or older
- pretty eastern, maybe chinese but it can also be western with a little inspiration. Not classic anime style (neither modern nor old like astro boy)
- there was training in an mountain area involved, the hero had to climb an unbelievable high mountain. I think I remember other trainings like carrying large buckets full of water
- whole atmosphere was darker, cannot remember many humans, maybe even some kind of ghost world
- saw it in the 80s as a child.. maybe 85
- it was well drawn for that time and not a childrens movie per se