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In the 4th game, I think only one unit is truly useful: the Thief. When playing as Chaos, you can safely rob all neutral level 1 creatures with a single Thief, scout the maximum amount of territory, and collect almost all guarded resources, losing only one Thief. After that, you won't have to worry about where to get resources to build more powerful creatures. That's why I play the fourth game the least.
2 Basson - please add the Thief to the list!