Summons are the way to go. Especially when combined with spells/incantations. You can kill most bosses by just summoning and using Rot Breath and just running away. Some bosses also have weaknesses that you can exploit.
But if all else fails, summoning other players is probably the easiest way.
For the fun of it, I just checked current incarceration numbers. It is about a 20000/per year. To be fair Czech population was lower back then (although I am not sure if they are not counting Slovakia as well, as they were one country) but still just, 200000 is pretty low for 40 years of “totality”.