Obscurity

Obscurity affects the visibility of a creature or object to other creatures in an area. A creature is considered to be Obscured while located in a Lightly Obscured or Heavily Obscured area, and gains the conditions  Lightly Obscured or  Heavily Obscured respectively. Otherwise, they are considered to be in a  Clear Area.

A wide variety of equipment can bestow specific benefits on a character while they are in an Obscured state. Unless specified otherwise, a creature does not need to be  Hiding to gain these bonuses, as long as the area they are standing in is Lightly or Heavily Obscured. If an item states the user or target must be obscured without specifying Lightly or Heavily Obscured, then both types fulfill the requirement.

A player character's obscurity status is important when trying to remain hidden within the line of sight of a non-allied creature. If the player character is in a clear area, they are spotted immediately. If lightly obscured, they must make periodic Stealth checks contesting the creature's Passive Perception score. If heavily obscured, they cannot be detected. However, creatures with  Darkvision effectively downgrade the obscurity level by one, meaning they immediately spot lightly obscured characters and force heavily obscured ones to make Stealth checks.

Items which grant special benefits when obscured

Weapons

Item	Effects
Knife of the Undermountain King	Shadow Blade You have Advantage on Attack rolls against Lightly or Heavily Obscured targets when using this blade.
Least Expected	Darkveil Precision While obscured in shadow, the wielder has a +1d4 bonus to their ranged weapon attacks.
Promise	Shadow Blade You have Advantage on Attack rolls against Lightly or Heavily Obscured targets when using this blade.
Shar's Spear of Evening	Shar's Blessing You gain Advantage on Saving throws while Lightly or Heavily Obscured. This weapon deals an additional 1d6 damage to creatures that are Lightly or Heavily Obscured.

Clothes and Armour

Item	Effects
Dark Justiciar Half-Plate (Rare)	Shar's Umbrae While obscured, the wearer has Advantage on Stealth Checks.
Dark Justiciar Half-Plate (Very Rare)	Shar's Umbrae While obscured, the wearer has Advantage on Stealth Checks.
Dark Justiciar Mail	Nightsinger's Reply While Obscured by shadow, the wearer deals 1d4Necrotic to attackers that hit them with a melee attack.
Penumbral Armour	Stealthier While Obscured, the wearer gains +3 bonus to Stealth Checks
Shadeclinger Armour	Shadeclinger While Obscured, the wearer has Advantage on Saving throws.
Viconia's Priestess Robe	Shar's Umbrae While obscured, the wearer has Advantage on Stealth Checks.

Headwear

Item	Effects
Covert Cowl	Covert Critical While obscured, the number you need to roll a Critical Hit while attacking is reduced by 1. This effect can stack.
Dark Justiciar Helm	Swathed in Shadow While Obscured by shadow, the wearer gains +1 to Saving throws when attacked.[See: Bugs]
Dark Justiciar Helmet	Covert Critical While obscured, the number you need to roll a Critical Hit while attacking is reduced by 1. This effect can stack.
The Shadespell Circlet	Shadespell While the wearer is obscured in shadow, their spells gain a +1 bonus to Spell Save DC, making them more likely to succeed.

Gloves

Item	Effects
Dark Justiciar Gauntlets (Rare)	Beckoning Darkness Curse a creature to be haunted by darkness. It takes 2d8⁠⁠Necrotic damage if it enters or starts its turn in a Lightly or Heavily Obscured area.

Footwear

Item	Effects
Dark Justiciar Boots	Shadow Teleportation Teleport to an unoccupied, obscured spot.

Rings

Item	Effects
Ring of Twilight	Treader by Twilight You gain a +1 bonus to  Armour Class while obscured.
Shadow-Cloaked Ring	Shadowthief The wearer's weapon and unarmed attacks deal an additional 1d4 damage against  Lightly or  Heavily Obscured creatures, and creatures made of shadow.
Shadow Blade Ring	Shadow Blade Weave a shadowy shortsword in your hand that deals 2d8⁠⁠Psychic damage. Makes  Attack rolls with  Advantage when used to attack a target that is in dim light or darkness.