im playing on pc ive got mods but non of them change npc behavior (i do have one that ADDS npcs to the game but thats it) so the bug was first noticed while doing the dark brotherhood quest "who dun it" (killing all the people in the house without anyone knowing) i just would randomly hit one of them (anything would oneshot kill them even fist ) and nobody else would notice, also i killed them all that way and (pissed off that one of the funnest quest in the game was ruined) left and finsihed it, then in another quest i cast frenze on somone and it didnt do anything , they got that red tent on them but did not attack anyone, i did this to several people , now i just started doing the quest where i have to kill all the dark brotherhood members and im having the same issue that i had with the whodoneit quest, no1 notices the killings, or the attacks, the only one who notices is the one i am personaly attacking, and when i cast frenzy on them they waited around then decided "hey lets go attack the dark guardian" , the only people who notice when i attack or not are the guards (surprise)

The first one in the Whodunit? quest is, unfortunately, a bug of the vanilla game. People often credit it as their favorite quest, but in reality, it was impossible to get caught all along. Still a great quest, but the challenge is nonexistent.

However, it's not a bug when you're killing the Black Hand members in the DB questline. That's part of the quest. It should even say in your orders that the guards have been paid off to not intervene in the fight and look the other way.

guards dont bug me when im killing the black hand, but i was pissed off at the game and so i wanted to know how messed up the glitch was, so i went and attacked a random person and the only people who tried to help them were the guards

also just to elaborate in the game when i attack someone in the dark brotherhood the other people might at most stand up , but thats it they dont attack me or anything

also frenzy doesnt work

Not everyone will attack you if you attack someone else. Some people just yell or run away. The Dark Brotherhood members all have Infamy, so it's no surprise that the average citizen has no interest in helping them by attacking you.

I don't know why Frenzy doesn't work, unless the spell you're using is at too low of a level for the target you're trying to use it on, but I almost never use Frenzy so I'm not the expert on that.

im talking about other members of the dark brotherhood (in there shelter) will not attack me if i attack them

That's part of the normal game too. I don't know if I'd even call it a bug, I'd say they just don't care. They'll kick you out of the guild, but they won't put themselves at risk.

Probably a good indication that the whole cult thing and the actual worshiping of Sithis is just a farce.

ok but the guardian SHOULD attack me when it sees me attacking them,