In a multiplayer game, on a small map, at the highest difficulty level, demons consistently lose to Necropolis, Haven, and Sanctuary, which tank and tear through all encountered neutral creatures indiscriminately. The lack of healing spells makes a difference. It is almost impossible to capture monsters of level 4-7 in the first week without any losses.

Gentlemen, I would like to know if there are ways to compensate for the disadvantage in the first week? Or are there any combat tactics for the first week?