MKRU I Saved up for a crapton of items and managed to beat Dorian in a Spectacular Battle. A shame you don't get anything for doing so, but it was a crazy fun and long battle!
congratulations on beating him! I’ve had a few people tell me that they have been able to beat him now! I’m starting to feel bad that I have nothing programmed for when you actually do... yet! Rest assured, you will be getting rewarded for defeating him in an relatively soonish update! Not the upcoming version update, but likely the next one.