Hot Ashes is the 9th stage of Hustle Castle, It is a harder level that it’s suppose to be. The boss will target Archers first, then any mages you might have. The bosses physical resistance making mages the best for damage.
There are several ways of beating it, all of them will require upgrading your castle to higher levels or having certain gear. If you get stuck in the stage, check out the video walkthrough and learn how to beat Hot Ashes stage in Hustle Castle: Fantasy Kingdom.