Windstar
[12] Conqueror
Uh oh i think u messed up on cirian...the person at artoria's grave you see if you kill her you obtain her armor and weapons but if you don't and go somewhere else the next time you come back she will be gone forever from your playthrough and you need to go on your new game plus to see her again. To obtain chesters armor you simply just need to kill him then he drops his entire set.
Hmm really? That's probably the first case I've heard where you can only get their armor from killing non-hostile NPCs.