Justiciar's Greatshield is a rare Shield that allows the wielder to cast Darkness Cloak and gain advantage on Perception checks.
It's never the shield that kills you - but hearing your frantic steel thudding uselessly against this reinforced oak in the darkness is a good sign the end is near.
Properties
+2
Armour Class
Rarity: Rare
Weight: 2.7 kg / 5.4 lb
Price: 300 gp
Special
The wearer of this item gains:
Shield Bash: When a foe hits you with a melee attack, use a 
Reaction to knock them Prone unless they succeed a Dexterity 
Saving throw.
Darkness Cloak: Use a 
Bonus action once per Short Rest to cast Darkness Cloak.
Advantage on Perception Ability Checks.
Where to find
- Looted from Lyrthindor in the Gauntlet of Shar. Lyrthindor is involved in the quest Break Yurgir's Contract. He can be found at the foot of the large statue of Shar X: -713 Y: -732, though you must first speak with and follow the rats to this location in order to find him.