When I was young there was this animated movie about a teenage boy and a sorcerer that would turn animals and humans into stone or ice. I want to say that the sorcerer name was Aruku (sp). Any help would be grateful. I want to say that the hero was a unicorn but I am not sure.

Thank you

Unico: Mahô no shima e (1983) (http://www.imdb.com/title/tt0086515/) ?