[Agema]

My general reckoning is that under 10 horror marks and you don't have much to worry about. I've got a game with about 20 horror marked characters who almost certainly have only a few marks each, and none have been attacked in about 20 turns.

Getting up to 50 horror marks, something will be on it's way eventually that will put a weak or average thug at risk. Over 50 and you'll probably need a very good thug or SC to survive.

As noted, you can't tell how many horror marks you've got. But if your units are getting marked in battles against astral nations, you can see them cast and know roughly how serious it is.