Nargott
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In Heroes 3, you could capture a neutral town and, in principle, develop it quite well within the first week. "Quite well" means reaching the higher tiers (except for the highest one). I think that at least the same dynamics should be preserved here.
But what happens when a secondary town is captured? Let's take day three as a reference point; this means being 2 days behind the first town. And if the secondary town is not developed at all, say, at level 1? The delay will be another +2 days (a total of 4 days), and there's no point in thinking about reaching high tiers in the first week. From this, it follows that neutral towns should be developed at least as well as the starting town. And from this, it follows that certain buildings (tavern, tier 1) will always be built in all towns, i.e., their cost is irrelevant.
Comparative rates of the fastest possible development of various creatures in Heroes 3 (if there is no tier 2 from the start):
Day 0 (start): Tier 1 of all races
Day 1: Tier 2 of all races, Tier 3 of all races (except griffins)
Day 2: Tier 4 (swordsmen, pegasi, vampires, demons, basilisks, ogres), Tier 5 (dendroids, rocs), Tier 6 (wyverns)
Day 3: Tier 3 (griffins), Tier 4 (medusas), Tier 5 (liches, infernos, gorgons), Tier 6 (cyclops), Tier 7 (monsters)
Day 4: Tier 4 (mages), Tier 5 (monks, minotaurs), Tier 6 (cavalry, unicorns, manticores, ifrits)
Day 5: Tier 5 (djinns), Tier 6 (nagas, knights of the grave), Tier 7 (angels, hydras)
Day 6: Tier 7 (bone dragons, devils)
Day 7: Tier 7 (green dragons, titans)
Day 8: Tier 7 (black dragons)
But what happens when a secondary town is captured? Let's take day three as a reference point; this means being 2 days behind the first town. And if the secondary town is not developed at all, say, at level 1? The delay will be another +2 days (a total of 4 days), and there's no point in thinking about reaching high tiers in the first week. From this, it follows that neutral towns should be developed at least as well as the starting town. And from this, it follows that certain buildings (tavern, tier 1) will always be built in all towns, i.e., their cost is irrelevant.
Comparative rates of the fastest possible development of various creatures in Heroes 3 (if there is no tier 2 from the start):
Day 0 (start): Tier 1 of all races
Day 1: Tier 2 of all races, Tier 3 of all races (except griffins)
Day 2: Tier 4 (swordsmen, pegasi, vampires, demons, basilisks, ogres), Tier 5 (dendroids, rocs), Tier 6 (wyverns)
Day 3: Tier 3 (griffins), Tier 4 (medusas), Tier 5 (liches, infernos, gorgons), Tier 6 (cyclops), Tier 7 (monsters)
Day 4: Tier 4 (mages), Tier 5 (monks, minotaurs), Tier 6 (cavalry, unicorns, manticores, ifrits)
Day 5: Tier 5 (djinns), Tier 6 (nagas, knights of the grave), Tier 7 (angels, hydras)
Day 6: Tier 7 (bone dragons, devils)
Day 7: Tier 7 (green dragons, titans)
Day 8: Tier 7 (black dragons)