Thundax
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It seems pretty simple there; a bunch of resources are gathered by secondary heroes to build 4 levels of magic, the level 5 spell is Dimension Door, and ghosts are brought to the main hero. Then, a kitted-out hero with lots of movement points and spell points jumps many times to the most profitable spots for feeding ghosts. In general, in Two, Dimension Door is just an incredibly powerful thing, because the number of moves is limited only by the amount of mana and movement, which can be simply astronomical, considering artifacts, artesian wells, oases, stables.