Armor Class 18 ({@item chain mail|phb}, {@item shield|phb})
Hit Points 39 (6d8 + 12)
Speed 25 ft.
Damage Resistances poison
Senses darkvision 120 ft., passive Perception 10
Languages Dwarvish, Undercommon
Challenge 2
Duergar Resilience. The duergar has advantage on saving throws against poison, spells, and illusions, as well as to resist being charmed or paralyzed.
Phalanx Formation. The duergar has advantage on attack rolls and Dexterity saving throws while standing within 5 feet of a duergar ally wielding a shield.
Sunlight Sensitivity. While in sunlight, the duergar has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
King's Knife (Shortsword). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage, or 11 (2d6 + 4) piercing damage while enlarged.
Javelin. Melee or Ranged Weapon Attack: +6 to hit, reach 5 ft. or range 30/120 ft., one target. Hit: 7 (1d6 + 4) piercing damage, or 11 (2d6 + 4) piercing damage while enlarged.
Enlarge (Recharges after a Short or Long Rest). For 1 minute, the duergar magically increases in size, along with anything it is wearing or carrying. While enlarged, the duergar is Large, doubles its damage dice on Strength-based weapon attacks (included in the attacks), and makes Strength checks and Strength saving throws with advantage. If the duergar lacks the room to become Large, it attains the maximum size possible in the space available.
Invisibility (Recharges after a Short or Long Rest). The duergar magically turns invisible for up to 1 hour or until it attacks, it casts a spell, it uses its Enlarge, or its concentration is broken (as if concentrating on a spell). Any equipment the duergar wears or carries is invisible with it.
Mordenkainen's Tome of Foes, p. 191