The following list indicates all heroes that carry over from one mission to at least one subsequent mission, along with the missions in which they appear. For example, “2-4” indicates that the hero first appears in mission 2 of the campaign and carries over into missions 3 and 4.
11. Universal Combat Strategy. 1. Castle. When you are the Castle town type it is a good idea to get up some money first. Castle buildings aren't cheap, and when you upgrade to City hall you will have built a mage guild, which is a prerequisite for a monastery, and a blacksmith, which is a prerequisite for a Barracks.
1st - tavern - get a hero or two. 2nd. 2a - specters a really good hitter, not only a support. 2b - town hall - this game has powerful healing and no troops are needed right away. 3rd - go for all core units week 1 + some gold OR be a good multiplaier and find 7 crystals - than go for liches.
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