InoyOleh
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Okay, tell me then, what is the reason why the following opening strategy isn't optimal: build skeletons on turn 1; upgrade them to archers on turn 2; and dragons on turn 3?
By buying the minimum (1 dragon, the rest archers), I can easily clear the guards in the first week (even without buying a tent or having the Undead skill), with minimal losses.
Going through zombies, ghosts, or other tiers seems worse than rushing to a mobile, super-tank unit.
P.S. There's an option to tie such a strong Necropolis building in your mod, like the Temple of the Underworld (capturing villages and turning their creatures into undead), to a less popular base (branch) like zombies or ghosts (for example), thereby increasing the attractiveness of that tier. Tying the Temple to the Stronghold makes this branch more of a priority (for days 4-7 of the first week) than others.