Duergar Alchemist

The duergar has advantage on saving throws against poison, spells, and illusions, as well as to resist being charmed or paralyzed.

While in sunlight, the duergar has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

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.

Melee Attack Roll: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) piercing damage, or 11 (2d8 + 2) piercing damage while enlarged.

Ranged Attack Roll: +4 to hit, range 20 ft., one target. Hit: 7 (2d6) acid damage.

Ranged Attack Roll: +4 to hit, range 20 ft., one target. Hit: 2 (1d4) fire damage at the start of each of the target's turns. A creature can end this damage by using its action to make a successful DC 10 Dexterity check to extinguish the flames.

The duergar magically turns invisible until it attacks, casts a spell, or uses its Enlarge, or until its concentration is broken, up to 1 hour (as if concentration on a spell). Any equipment the duergar wears or carries is invisible with it.