Cinder Goblin

•  Caldera Native. The goblin is immune to the environmental hazards of extreme heat, volcanic ash inhalation, and sulfuric fumes. It can move across magma crusts, hot coals, and cooled lava without spending extra movement or taking fire damage.

• Ash-Veil Camouflage. The goblin has Advantage on Dexterity (Stealth) checks made while in areas heavily obscured by volcanic smoke, soot, or falling ash.

• Heated Body. A creature that touches the goblin or hits it with a melee attack while within 5 feet of it takes 2 (1d4) fire damage.

•  Obsidian-Tipped Scramseax (Dagger). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage plus 2 (1d4) fire damage.

• Magma Scoop & Fling. Ranged Weapon Attack: +4 to hit, range 20/60 ft., one target. Hit: 5 (1d6 + 2) fire damage. The target must succeed on a DC 11 Dexterity saving throw or catch fire, taking 2 (1d4) fire damage at the start of each of its turns until someone spends an action to douse or scrape off the clinging magma.

• Searing Slag-Stone (Sling). Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage plus 2 (1d4) fire damage as the porous, glowing pumice stone shatters on impact.

Cinder Skitter. The goblin takes the Disengage or Hide action. If it is standing within 5 feet of a lava pool, vent, or heavy smoke, it can also disperse a small puff of blinding soot; adjacent creatures cannot make Opportunity Attacks against it until the start of its next turn.

Thermal Vent Rupture (1/Encounter). When an enemy creature moves within 5 feet of a crack or fissure in the volcanic stone near the goblin, the goblin violently slams the ground or dislodges a basalt capstone.

• A jet of superheated gas and burning pumice bursts forth in a 10-foot line.

• The triggering creature must make a DC 11 Dexterity saving throw, taking 7 (2d6) fire damage on a failed save, or half as much on a successful one.