Board Thread:Questions and Answers/@comment-26290068-20141006233222/@comment-3571236-20141130161948

Well, Rovio wanted to promote Angry Birds Epic in japan as much as they could (because japan has tons of japan exclusive stuff so getting here wasn't easy in any way) and giving away Ronin as Knight upgrade was the only way

Yep, using their culture against themselves or something is really weird, and so is japan >:)