Black Knife Set is an Armor Set in Elden Ring. Black Knife Set is a special heavy armor used by assassins due to its stealth-enhancing materials. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.
The full set is found on a corpse under an archway behind Ordina, Liturgical Town in Consecrated Snowfield. [Map here]
The Black Knife Armor can be altered to the Black Knife Armor (Altered) to remove the cape.
The chest armor piece of this set muffles the sound of the wearer's footsteps, similar to the effect of the Crepus's Vial talisman and the Assassin's Approach incantation. The chest armor piece needs to be unaltered, with the cape intact, to receive this bonus. The cape only adds 0.2 weight, so leaving it on is highly advised. This silence effect also affects the wearer's rolls and jumps.
The chest piece comes with an almost fully transparent cloak, including a hood.
The hood is worn over the following helms and other headwear:
Black Knife Hood
Bloodsoaked Mask
Astrologer Hood
Perfumer Hood
Chain Coif
Fingerprint Helm
Eccentrics Hood (Altered)
Nox Swordstress Crown (Altered)
Nox Monk Hood (Altered)
Poise updated to patch 1.07. See Patch Notes for details.

Physical: 22.5
Versus Strike: 21.6
Versus Slash: 24.4
Versus Pierce: 24.4
Magic: 17.5
Fire: 18.9
Ligt: 13.5
Holy: 22.5
Immunity: 65
Robustness: 108
Focus: 54
Vitality: 54
Poise: 40

Physical: 3.8
Versus Strike: 3.6
Versus Slash: 4.2
Versus Pierce: 4.2
Magic: 2.8
Fire: 3.1
Ligt: 2.1
Holy: 3.8
Immunity: 11
Robustness: 18
Focus: 9
Vitality: 9
Poise: 6

Physical: 11.4
Versus Strike: 10.9
Versus Slash: 12.4
Versus Pierce: 12.4
Magic: 8.8
Fire: 9.5
Ligt: 6.7
Holy: 11.4
Immunity: 28
Robustness: 46
Focus: 23
Vitality: 23
Poise: 19

Physical: 2.8
Versus Strike: 2.7
Versus Slash: 3.1
Versus Pierce: 3.1
Magic: 2.1
Fire: 2.3
Ligt: 1.6
Holy: 2.8
Immunity: 9
Robustness: 15
Focus: 8
Vitality: 8
Poise: 4

Physical: 6.5
Versus Strike: 6.2
Versus Slash: 7.1
Versus Pierce: 7.1
Magic: 5
Fire: 5.4
Ligt: 3.8
Holy: 6.5
Immunity: 17
Robustness: 29
Focus: 14
Vitality: 14
Poise: 11

Old Aristocrat Set is an Armor Set in Elden Ring. The Old Aristocrat Set is a light cloth set worn by the Old Nobles commonly found wandering the roads. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Omen Set is an Armor Set in Elden Ring. Worn by the Dung Eater, their form is a vision of the landscape of his mind, and his appearance as he wished to see it. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Omenkiller Set is an Armor Set in Elden Ring. Omenkiller Set is a Light Weight armor that increase Strength and provides light Physical and moderate Magical defense. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Page Set is an Armor Set in Elden Ring. Page Set armor worn by pages who serve the nobility and are mindful to keep them out of harm's way. The unassuming sack-like appearance befits their unseen and unknown stature. Traveling wear tailored with exquisite precision, to avoid any undue shame for the page's master. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Perfumer Set is an Armor Set in Elden Ring. The Perfumer Set is worn by the Perfumer enemies found throughout Leyndell, Royal Capital. Sets of Armor in Elden Ring are composed of four armor pieces which are Perfumer Hood, Perfumer Robe, Perfumer Gloves, and Perfumer Sarong.

Perfumer Traveler's Set is an Armor Set in Elden Ring. Perfumer Traveler's Set is the attire of a traveling perfumer of no renown. An associate of a healer, he is said to be in search of new armatics and flower gardens, in hopes of treating Misbegotten, Omen and all those seen as impure. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Preceptor's Set is an Armor Set in Elden Ring. Preceptor's Set is usually worn by the magic preceptors who served the Carian royals.Increases mind to the detriment of stamina. Glintstone sorcerers are the descendants of astrologers, a fate has been long severed from the stars. Sets of Armor in Elden Ring are composed of four armor pieces which are Preceptor's Big Hat, Preceptor's Long Gown, Preceptor's Gloves, and Preceptor's Trousers.

Prisoner Set is an Armor Set in Elden Ring. Prisoner Set is a Lightweight armor Set that boosts Focus and Vitality Resistances. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Prophet Set is an Armor Set in Elden Ring. The Prophet Set is a 3-piece Light Weight armor that does not offer much in the way of protection but also does not hinder a character's ability to move quickly. This set caters to beginner Intelligence characters. Armor provides our character with protection and different resistance against all types of damage and negative status effects. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.