I don't quite understand the idea of Ascension but I've read on other forums that it turns a +5 reinforced weapon to a magical weapon that will only increase in damage if you increase your Faith. My character was not built for faith. Maybe for Intelligence, but not Faith. Now I'm deciding if I should kill the blacksmith because he holds the ultra expensive "Crest of Artorias" which opens the door in the forest. I remember killing him on my previous character and looted the crest off his corpse. Something else that I was told is that the area where the door blocks is an excellent place to grind.
Will I have any use for the blacksmith in the future? Should I kill the blacksmith?