Boots offer the highest magic defense, as well as second highest fire defense (equal to that of Black Dragon leggings, Bone King and Saint's boots and almost equal to that of Alonne Knight and Syan's leggings).
Robe offers second highest magic defense.
Hood grants +2 to INT and FTH and improves casting speed (edit: more than Chaos Hood).
Sold by Merchant Hag Melentia (15k, minus hood) if Straid is killed.
Obtained from Straid of Olaphis by trading him 4 boss souls and speaking to him.
During this hiatus, kingdoms rose and fell, until the land called Drangleic came to be." Straid was invited to the old kingdom of Olaphis for his wisdom, but its depth was such that people soon feared him, and in the end Straid was led into a dreadful trap. "Black Hood/Robe/gloves/Boots Belonged to Straid of Olaphis. Featuring key visuals, concept art, character, weapon, and monster designs, and rough sketches, this is a complete picture of the brutal world of Dark Souls. Armor sets do not provide specific benefits, so players are free to mix and match their preferred parts to optimize their Builds. Dark Souls: Design Works showcases the grim and haunting artwork behind the fan-favorite Dark Souls game in a gorgeous full-color hardcover collection. Black Set is an Attire or Armor in Dark Souls 2.