Would probably help if so many things weren't solved with 1 player, leaving the rest to do nothing but DPS.

"Kite this monster", 1 dude.

"Craft potions", 1 dude.

"Portal the group to far far away,", 1 dude.

Weird to say, but need to nerf the special characters so more people have to do them?
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Procedural generation would help a lot too. Once a map is "solved", all the explore type abilities are done.
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