Eliminate the guardians of the capitals.

Have you ever tried this? How successful were you? Maybe you can suggest a good tactic? We are only discussing cases where overwhelming the guardians is done purely for fun. We will ignore scenarios with guardians that are intentionally weakened. I remember once, I managed to take down the capital of the Necropolis with a heavily buffed Dryad (level 20, I think) and a corresponding army. I drank a bunch of potions and went to the capital, singing inappropriate songs at the top of my lungs. Pure brute force and nothing else. I managed to defeat the guardian, but it was quite difficult. I didn't have enough potions left for other capitals)))