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This is one nasty combo of critters found as an Asset in the Dungeon Editor. I like 'em a lot and plan to use them in my custom dungeon. However, I do not remember this specific mob pair in the main campaign. Were they implemented anywhere as a pair? Just curious.
Lots of assets are defined but don't appear in the main campaign, e.g. dark_acolyte_pair, herder_swarm, herder_twigroot_pair, medusa_pair, zarchton_pair, flute, scope, spirit_crook...