In my opinion, Dungeon has no chance of winning on small maps. There, Mages and Orcs dominate...
And using a Dark Ritual, where each turn is expensive, is at least reckless. On maps like Outlands, everything usually ends in the middle of the 2nd or early 3rd week... In that time, it will be problematic for a Warlock to upgrade, even with what the respected Lordesat mentioned.
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