Mushroom Set is an Armor Set in Elden Ring. Mushroom Set is a Light Weight armor with mushrooms growing all over that that does not offer much in the way of protection but boosts superior Immunity, 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.
The Mushroom Crown is found on a corpse hanging off of a pillar ruin in the south-eastern corner of Lake of Rot. [Elden Ring Map here] The rest of the set is found in Seethewater Cave, in a cavern with a Giant Poison Flower and multiple mushroom people. [Elden Ring Map here]
Has the highest immunity in the game for every slot. The Crown has slightly more immunity than the Head.
Poise updated to patch 1.07. See Patch Notes for details.

Physical: 12.5
Versus Strike: 14.5
Versus Slash: 5.5
Versus Pierce: 10.9
Magic: 26.1
Fire: 10.9
Ligt: 25.3
Holy: 25.6
Immunity: 243
Robustness: 57
Focus: 215
Vitality: 181
Poise: 11

Physical: 2.1
Versus Strike: 2.5
Versus Slash: 0.9
Versus Pierce: 1.8
Magic: 4.7
Fire: 1.8
Ligt: 4.6
Holy: 4.6
Immunity: 44
Robustness: 10
Focus: 39
Vitality: 33
Poise: 2

Physical: 6.1
Versus Strike: 7.1
Versus Slash: 2.7
Versus Pierce: 5.3
Magic: 13.3
Fire: 5.3
Ligt: 12.8
Holy: 13
Immunity: 102
Robustness: 24
Focus: 90
Vitality: 76
Poise: 5

Physical: 1.5
Versus Strike: 1.7
Versus Slash: 0.6
Versus Pierce: 1.3
Magic: 3.3
Fire: 1.3
Ligt: 3.2
Holy: 3.2
Immunity: 34
Robustness: 8
Focus: 30
Vitality: 25
Poise: 1

Physical: 3.4
Versus Strike: 4
Versus Slash: 1.5
Versus Pierce: 3
Magic: 7.6
Fire: 3
Ligt: 7.3
Holy: 7.4
Immunity: 63
Robustness: 15
Focus: 56
Vitality: 47
Poise: 3

Sanguine Noble Set is an Armor Set in Elden Ring. Sanguine Noble Set has high Magic/Lightning/Holy damage negation and good Focus/Vitality resistance. Sets of Armor in Elden Ring are typically composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Scaled Set is an Armor Set in Elden Ring. This was worn by Old Knight Istvan. The corroded metal is reinforced with rock-hard scales, making it highly effective against non-physical attacks. Istvan is one of a few wizened Tarnished who survive to this day. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Shaman Set is an Armor Set in Elden Ring. Shaman Set is worn by the Ancestral Follower Shaman found singing in the Ancestral Woods of Siofra River. The set does not have any gloves. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Snow Witch Set is an Armor Set in Elden Ring. Snow Witch Set. Sets of Armor in Elden Ring are usually composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor but this one does not have gauntlets.

Spellblade Set is an Armor Set in Elden Ring. Spellblade Set . Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor. All pieces boost effectiveness of Glintstone sorcery skills.

Traveler's Set is an Armor Set in Elden Ring. The set is a light cloth armor set worn by Millicent and Melina but missing Melina's green cloak. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Traveling Maiden Set is an Armor Set in Elden Ring. Traveling Maiden Set is a Lightweight armor that does not offer much in the way of physical protection, but boasts superior 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.

Tree Sentinel Set is an Armor Set in Elden Ring. The Tree Sentinel Set is a Heavy Weight armor that boasts superior overall Physical defenses and high Fire defense. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.

Twinned Set is an Armor Set in Elden Ring. Twinned Set is a Medium Weight Armor that depicts the entwined twins of gold and silver. Sets of Armor in Elden Ring are composed of four armor pieces which are Helms, Chest Armor, Gauntlets, and Leg Armor.