The Brotherhood of Blood covenant allow players to invade other players' worlds with the aim of killing them, which in turn, rewards a Token of Spite, an item that can increase rank in this covenant.
This covenant is found in Undead Purgatory, once you have defeated the Executioner's Chariot. Go and talk to the NPC Titchy Gren to join the Brotherhood of Blood. You will receive the Crest of Blood ring after joining.
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