Blade of the Darkmoon

Blade of the Darkmoon is a pvp-oriented covenant in Dark Souls.

Requirements
Must not have killed Dark Sun Gwyndolin. If the player has killed Gwynevere, they must request absolution from Oswald before joining.

How to Join
First, acquire the Darkmoon Seance Ring in The Catacombs. Go to the bottom level of the rotating elevator in Anor-Londo (this is called the Darkmoon Tomb while warping) while wearing the ring. Past the room with the bonfire, Dark Sun Gwyndolin will ask the player to swear fealty to the Blades of the Darkmoon. Kneel at the fog door to join the covenant.

Benefits
Upon joining, players receive: Further rewards are unlocked upon leveling up in the covenant, which promotes based on number of souvenirs of reprisal donated. At +1 (10 souvenirs), players are rewarded the Darkmoon Blade miracle, and the Darkmoon Talisman—potentially the strongest talisman in the game.
 * Blue Eye Orb
 * Darkmoon Blade Covenant Ring

Players may only use the Darkmoon Blade miracle when they are in the Blade of the Darkmoon covenant; the buff is initially 1.8x of the magic adjust of the talisman, but will gain 0.1 with every level gained in the covenant (so at +1 the adjust is 1.9, +3 would be 2.1 in total).

Activities
Blades of the Darkmoon hunt players that have killed Gwynevere or other players or betrayed their covenant. Players invade as a spirit of vengeance. Players risk nothing invading other people's worlds (cannot be indicted) and gain a Souvenir of Reprisal for each guilty player they defeat.

Betrayal Penalties
Entering Gwyn's Tomb to confront Gwyndolin counts as a betrayal. Killing the Darkmoon Knightess does NOT count as a betrayal.

Overview
Blade of the Darkmoon is considered one of the more difficult covenants to master. Every person the player invades as a spirit of vengeance is guaranteed to have some sort of pvp experience, and so will usually put up a tougher fight than people invaded by darkwraiths. To make matters worse, people in Dark Anor Londo are likely to be duel-mongerers who kill Blades of the Darkmoon for fun or for souls. They very often have friendly summons with them.

However, the Blade of the Darkmoon covenant is very worthwhile indeed. The Darkmoon Talisman has the best miracle adjust in the game, so any player who relies on miracles would benefit from joining this covenant; in turn, Darkmoon Blade is an excellent weapon buff. With patience and preseverance, players may yet reap the benefits of the Blade of the Darkmoon.