If a hero's defense is, say, 17, then 17 is added to the defense of BOTH upgrades.
That is, if one of the upgrades has higher combat stats, they will be higher in any case, regardless of the hero's parameters and build.
This is relevant to the fact that if it is assumed that the Dungeon faction will rush forward, it is still better to take Imps – their stats will be higher in any case.
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