Great Grey Wolf Sif

 is a boss. Found in Darkroot Garden. He guards the grave of Artorias the Abysswalker, one of Gwyn's four knights.

Killing it is a must in order to obtain the Covenant of Artorias (which in turn lets you fight the Four Kings).

Statistics
Normal Game: 3,432 HP, 30,000 Souls New Game+: ? HP, ? Souls

Attacks
?

Drops
Upon killing it you obtain the Covenant of Artorias and the Soul of Sif.

Strategies
?