It's just humans you can't kill I believe. I joined forest covenant until I beat spiderbitch, then I joined chaos covenant. I then went back to the forest and killed a bunch of the humans for souls. When I talk to Alvine now, she still gives me the option of joining the cult. So you just can't kill them when you're in the cult, but if you kill theem when you aren't she doesnt care at all.
And yes, I prefer to call them cults instead of covenants.
and you don't *need* to enter the door I dont think. There's a back way through behind the Hydra.
Just know that going that way means you might get raped by some pretty strong plant people and some black cats.
Get the crest to unlock the door anyways. it's a lot faster
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