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Also, the following factors are important for determining the "fragility" of a structure:
-) Wistan
-) type of surface - swamp;
-) presence of a blessing (I never managed to get Wistan a blessing on the first level, unless it was a guild in the secondary level, but this depends on the starting conditions and the template).
In principle, a slightly improved Wistan (preferably with an attack artifact) with a blessing on a swamp, fighting against upgraded lizards, deals damage like a level 3 unit.