Tactics for the Stronghold.

The question is this: what Stronghold army can already venture into Dragon Utopias if there were no cons, hives, or uber-niches, or only a minimum (up to 2-3 angels, up to 10-12 wyverns). Let the combat parameters of hero Gurnisson be 15-20 in total (meaning something like 12-6).

If you upgrade the bears and ogres, then you can boldly go on 131! 5 grey bears will decide it there, and ogres are perfect as meat!
If you have angels or wyverns, and expert shield/leather, then you can even do it in the second week. Much still depends on the pace of the game. There are situations where you can wait until 131 and smash them without losses, and there are times when you must venture in as early as the 2nd week because by 131 you might already be killed