While WC3 did of course come with heroes who had stats, experience, and unlockable abilities as standard, custom map makers didn’t rest on their laurels. (See: This is what it would look like if Dota 2 became Hearthstone) These maps ranged from linear, story-based experiences that could often be played solo, offline, to huge sprawling open-world adventures where venturing into dangerous lands too early would spell doom for the players.
While never as popular as the competitive games, open RPGs were some of the most creative uses of the WC3 engine. Not one title, but an entire genre of custom map.