I don't know how important Petrus is but he engaged me after I attacked him and I had to kill him because he started attacking me on sight. After I opened The Depths, I went to talk to that priest that's hanging around him, and she attacked me, too, along with 2 guys. I wanted to buy the heal spell from her. Can I still finish the game, or even make them neutral? Also, I killed the vendor right after the Gargoyle fight under the bell tower...
I killed Petrus of Thorolund and the curse cure vendor on PC
You can still get curses dispelled by Ingward in New Londo.
You killed two miracle vendors and the NPC in the first Bell Tower is Oswald the pardoner.
Basically you won't be able to buy a bunch of miracles or absolve your sins, had you not killed Oswald you may have been able to reset any angry NPCs but that is no longer an option for you. I'd try not to piss anyone else off if you value their services.
And yeah, you can still finish the game. No NPC is really that important.
@envane: He mostly picks off stuff from clerics that he despises for an odd reason.
@Nightly1029: Well for your first run, you can think of it this way, It's completely different game now that you have lost their service which will probably increase your "Instincts" regarding your ability to survive as many encounters that you come across.
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