Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.
Magic Resistance. The obsidian dragon has advantage on saving throws against spells and other magical effects.
Innate Spellcasting (Psionics). The adult obsidian dragon's innate spellcasting ability is Intelligence (DC 20, +12 to hit). The adult obsidian dragon can innately cast the following spells, requiring no material components:
At will: enhance ability, plane shift, protection from energy
3/day each: detect poison and disease, faerie fire, mage armor (invisible), scorching ray, wall of force (invisible)
1/day each: awaken, modify memory
Multi attack. The adult obsidian dragon uses its frightful prescience then makes a bite attack and two claw attacks.
Bite. Melee Weapon Attack: +6 to hit, reach 10 ft., 1 target. Hit: 10 (2d8 + 2) piercing damage and 4 (2d4) fire damage.
Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 6 (2d4 + 2) slashing damage.
Tail. Melee Weapon Attack: +6 to hit, reach 10 ft., 1 target. Hit: 8 (2d6 + 2) bludgeoning damage.
Frightful Presence. Each creature of the dragon’s choice that is within 120 feet of the dragon and aware of it must succeed on a DC 13 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature’s saving throw is successful or the effect ends for it, the creature is immune to the dragon’s Frightful Presence for the next 24 hours.
Fire breath (Recharges on 5/6). The obsidian dragon exhales a 30ft cone of flame and each creature within range must make a DC 13 Dexterity saving throw or take 45 (15d6) fire damage. On a successful save the target takes half damage.
The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time, and only at the end of another creature’s turn. The dragon regains spent legendary actions at the start of its turn.
Detect (Costs 1 Action). The dragon makes a Wisdom (Perception) check.
Tail Attack (Costs 1 Action). The dragon makes a tail attack.
Teleport (Costs 2 Actions). The obsidian dragon teleports up to 100ft to a place that they can see that isn't currently occupied.
Description
Obsidian dragons, while the most intelligent of the gem dragons, are also the most vicious. They are extremely haughty, anger easily, and like to toy with prey before finishing it off.
An obsidian dragon has smooth black skin with razor edges where joints come together. When first hatched, their scales are gray, rough to touch, and well defined. As they get older, the scales darken, become smoother, and begin to blend together.
Most obsidian dragons prefer to make their lairs around volcanoes or in one of the mountains of coal found on the Elemental Plane of Fire.
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