Board Thread:Dark Souls/@comment-2229428-20130913054520/@comment-24424481-20140116060013

Matsczon wrote: Don't trust Wikidot. They don't put references on what they write.

I can confirm that PvE and PvP sin both allow Darkmoons to invade. I've been invaded on multiple characters where I haven't even met any other players, but killed one or more NPCs.

You can also remove the sin for killing Gwynevere, which allows you to join the Darkmoons. I belive sin is added for Killing GWYNEVERE, and you can no longer join the darkmoons becuase GWYNDOLIN sets Anor Londo into twlight. thus he is the boss.