Elden Ring is one of my favourite open world game that is full of enriching weapons and armors.
Weapons and Armors in Elden Ring contains special powers that helps you servive fight evil boss and much more.
I have tried to collect all weapon and armor with its special effects.
I have made this guide for easy visulization of weapon and armor and its special effects in Elden Ring.
Head Armor:
Head Armor can help you serve heavy blows from Area bosses but each Head Armor have its pros.
Here i have compilied the data from net avaliable and pictures of Head Armor with its location

Black Dumpling:
boost damage 10% for 60 seconds after you suffer madness
Location: Volcano Manor

Mushroom Crown:
boost damage 10% for 20 seconds after you or an enemy suffer poison/scarlet rot
Location: Lake of Rot

White Mask:
boost damage 10% for 20 seconds after you or an enemy suffer bleed
Location: Mohgwyn Dynasty Mausoleum

Pumpkin Helm:
âreduces damage from headshots and impactsâ
Location: Castle Morne

Cerulean Tear Scarab:
improves flask of cerulean tears recovery by 10%, but has negative resistances
Location: Sellia, Town of Sorcery

Glintstone Scarab:
reduces sorcery costs by 15%, but has negative resistance
Location: Raya Lucaria Academy

Incantation Scarab:
reduces incantation costs by 15%, but has negative resistance
Location: Artistâs Shack

Ash-of-War Scarab:
reduces weapon skill costs by 15%, but has negative resistance
Location: Stormveil Castle

Jar:
boost throwable item damage by 15%
Location: Alexanderâs quest

Shining Horned Headband:
boost the damage of âAncestral Infantâs Headâ reusable item by 20%
Location: Siofra River

Envoy Crown:
boost âbubbleâ weapon skills by 15%
Location: Miquellaâs Haligtree

Radiant Gold Mask:
boost golden order incantations by around 10%
Location: Altus Plateau

Snow Witch Hat:
boost âcoldâ sorceries by 10%
Location: Ranniâs quest

Azurâs Glintstone Crown:
boost âAzurâs sorceriesâ by 15%, but increases all spell costs by 15% (see below for info)
Location: Sorceress Sellenâs quest

Lusatâs Glintstone Crown:
boost âLusatâs sorceriesâ by 15%, but increases all spell costs by 15%
Location: Sorceress Sellenâs quest

Crimson Hood: +1 vigor
Location: Stormveil Castle

Navy Hood: +1 mind
Location: Altus Plateau

Omensmirk Mask: +2 strength
Location: Leyndell, Royal Capital

Consortâs Mask: +1 dexterity
Location: Tanithâs quest

Queenâs Crescent Crown: +3 intelligence
Location: Roundtable Hold

Rulerâs Mask: +1 faith
Location: Altus Plateau

Sacred Crown Helm: +1 faith
Location: Elphael, Brace of the Haligtree

Haligtree Helm: +1 faith
Location: Elphael, Brace of the Haligtree

Haligtree Knight Helm: +2 faith
Location: Elphael, Brace of the Haligtree

Marais Mask: +1 arcane
Location: Mt. Gelmir

Mask of Confidence: +3 arcane
Location: Carian Study Hall (inverted)

Imp Head (Wolf): +2 endurance
Location: Minor Erdtree Catacombs

Imp Head (Fanged): +2 strength
Location: Dropped by Imps

Imp Head (Long-Tongued): +2 dexterity
Location: Subterranean Shunning Grounds

Imp Head (Cat): +2 intelligence
Location: Dropped by Imps

Imp Head (Corpse): +2 faith
Location: Leyndell, Royal Capital

Imp Head (Elder): +2 arcane
Location: Consecrated Snowfield Catacombs

Preceptorâs Big Hat: +3 mind, but -9% stamina
Location: Preceptor Seluvisâs quest

Okina Mask: +3 dexterity, but -44 focus
Location: Mountaintops of the Giants

Albinauric Mask:
+4 arcane, but reduces flask of crimson tears healing by 10%
Location: Volcano Manor

Silver Tear Mask:
+8 arcane, but reduces physical weapon damage scaling by a small amount (~5%)
Location: Nokron, Eternal City

Greathood: +2 intelligence & +2 faith, but -10% HP
Location: Elphael, Brace of the Haligtree

Haima Glintstone Crown: +2 intelligence & +2 strength, but -10% FP
Location: West Windmill Pasture

Hierodas Glintstone Crown: +2 intelligence & +2 endurance, but -10% FP
Location: Raya Lucaria Academy

Olivinus Glintstone Crown: +3 intelligence, but -9% HP
Location: Raya Lucaria Academy

Karolos Glintstone Crown: +3 intelligence, but -9% stamina
Location: Raya Lucaria Academy

Lazuli Glintstone Crown: +3 intelligence & +3 dexterity, but -18% HP
Location: Raya Lucaria Academy

Witchâs Glintstone Crown: +3 intelligence & +3 arcane, but -18% stamina
Location: Sorceress Sellenâs quest

Twinsage Glintstone Crown: +6 intelligence, but -9% HP & -9% stamina
Location: Raya Lucaria Academy
Chest Armor:

Black Knife Armor (donât alter chest): muffles sound
Location: Consecrated Snowfield

Commonerâs Garb & Commonerâs Simple Garb: +1 faith
Location: Stormveil Castle

Deathbed Dress: heals nearby allies (both summoned players and spirit ashes) by 2 HP/second
Location: Fiaâs quest

Godskin Noble Robe: boost âNoble Presenceâ incantation by 20%
Location: Divine Tower of Liurnia

Guardian Garb (Full Bloom): improves flask of crimson tears healing by ~1.5%, but has negative fire resistance
Location: Leyndell, Royal Capital

Raptorâs Black Feathers: boost jump attack damage by 10%
Location: Sageâs Cave
Full (or almost full) armor sets that do something for each piece:

Alberich set (NOT THE LEGS, donât alter chest): boost thorn sorceries, 5% per piece (15% w/ head+chest+gloves)
Location: Leyndell, Royal Capital

Briar set: rolling does damage, 2 dmg per armor piece (8 dmg full set)
Location: The Shaded Castle

Crucible Axe sets: boost crucible incantations, 4% per piece (16% full set)
Location: Auriza Heroâs Grave

Tree sets: boost crucible incantations, 4% per piece (16% full set)
Location: Deeproot Depths

Duelist sets (head+chest+legs, chest has to be the altered version): âbecome a slightly easier target for foesâ
Location: Leyndell, Royal Capital

Rotten Duelist sets (head+chest+legs, chest has to be the altered version): âbecome a slightly easier target for foesâ
Location: Consecrated Snowfield

Royal Remains set: recover 2 HP/second for each piece (8/s full set) whenever youâre below 18% hp
Location: Roundtable Hold

Spellblade set: boost cold/magic weapon skill damage by 2% per piece (8% full set)
Location: Sorcerer Rogierâs quest

Omen set: boost the damage of âOmen Bairnâ & âRegal Omen Bairnâ reusable items by 5% per piece (20% full set), also boosts Sword of Milosâ special post-skill R2s by 5% per piece
Location: Sorcerer Rogierâs quest
Shields With Special Effects:
All Shields with its special effects and its location in Elden Ring.

Pillory Shield: boost vitality by 50
Location: Gaol Cave

Perfumerâs Shield: boost immunity by 40
Location: Dropped by Perfumers and Depraved Perfumers

Coil Shield: boost immunity by 40
Location: Volcano Cave

Antâs Skull Plate: boost immunity by 60
Location: Nokstella, Eternal City

Smoldering Shield: boost robustness by 30
Location: Volcano Manor

Ice Crest Shield: boost robustness by 40
Location:

Rift Shield: boost focus by 40
Location: Liurnia of the Lakes

Shield of the Guilty: boost focus by 50
Location: Weeping Peninsula

Spiralhorn Shield: boost immunity/robustness/focus by 50
Location: Liurnia of the Lakes

Eclipse Crest Greatshield: boost immunity/robustness/focus by 50
Location: Dropped by Mausoleum Knights

Twinbird Kite Shield: boost defense and attack by 5% when below 20% HP
Location: Leyndell Deathbird

Icon Shield: recover 3 HP/second
Location: Woodfolk Ruins

Great Turtle Shell: boost stamina recovery by ~8%
Location: Weeping Peninsula
Weapons with passive effects :
Here are the Weapons and its special effects its gonna provide player with its location in Elden Ring.

Cleanrot Spear: boost immunity by 50
Location: Dropped by Cleanrot Knights

Grave Scythe: boost vitality by 35
Location:

Pestâs Glaive: boost magic/fire/lightning/holy resistances by 2% (has diminishing returns the more you already have)
Location: Drops from Lesser Kindred of Rot (Pests)

Highland Axe: boost roars and breath attacks (not dragon breath incantations) by 7.5%
Location: Stormveil Castle

Beast-Repellant Torch: makes normally aggressive animals passive unless attacked
Location: Dragonbarrow

Sentryâs Torch: reveals invisible enemies (black knife assassins)
Location: Hermit Merchantâs Shack

Blasphemous Blade: recover ~6.5% HP on kills
Location: Roundtable Hold

Serpent-Godâs Curved Sword: recover 5% HP on kills
Location: Ruin-Strewn Precipice

Sword of Milos: recover 5 FP on kills
Location: Subterranean Shunning-Grounds

Sacrificial Axe: recover 4 FP on kills
Location: Weeping Peninsula

Butchering Knife: gives 1% HP per hit
Location: Mt. Gelmir

Great Stars: gives 1% HP per hit
Location: Altus Plateau

CELEBRANTâS SICKLE: boosts bestial incantations by 10%
Location: Celebrant drop
There are probably also some weapon skills that buff yourself and let you keep the buff even after you 2h your other weapon, but I donât know for sure.
I am updating this list if its little bit off please let me know. Thanks