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Well, you're wrong about the lack of experience. Sometimes they give up to 7.5k experience. You can finish leveling up with arenas and trees. As for the hassle, it depends on the player. If someone doesn't want to control heroes separately, collect chests, and trick monsters (I call it "outsmarting"), then, of course, they can only level up one hero to level 50 on XL difficulty.
Proverb: Patience and hard work lead to high levels!
Proverb: Patience and hard work lead to high levels!