Ancient Stone Dragon

Deceptive Appearance. While in rocky terrain if an Ancient Stone Dragon remains motionless, it is indistinguishable from the terrain around it.

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Multiattack. The dragon can use its Benevolent Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 21 (2d10 + 10) piercing damage.

Claw. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 17 (2d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +17 to hit, reach 20 ft., one target. Hit: 19 (2d8 + 10) bludgeoning damage.

Benevolent Presence. Each creature that is within 120 feet of the dragon and aware of it must succeed on a DC 21 Wisdom saving throw. Any creature that fails the save have disadvantage on all attacks against the Dragon. If a creature, that failed the save, attempts to cast a spell on the Dragon they must succeed a DC 22 Wisdom saving throw. On a failed save the creature does NOT cast the spell, and lose their action for that turn. 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 Benevolent Presence for the next 24 hours.

Cataclysmic Divebomb. (cost 2 Actions) Melee Weapon Attack: +17 to hit, reach 120 foot cone, one target. Hit: 49 (9d10 + 10) bludgeoning damage.

       The Dragon on its turn uses the Dash Action to fly 160ft. into the air. On the Dragon's next turn, it chooses a creature within a 120 foot cone below it to attack with advantage. On a hit, the creature takes 9d10+10 bludgeoning damage and is knocked prone. The creature must make a DC 22 Dexterity saving throw, on a success they take half damage. The creature must then succeed a DC 21 Constitution saving throw, on a failed save the creature is stunned until the end of their next turn. Any other creature within 30 ft. must make a DC 17 Dexterity saving throw. Creatures that fail the save are pushed back 30 ft. taking 15 (2d6 +10) bludgeoning damage and are knocked prone. On a miss, the Dragon itself takes 9d10+10 bludgeoning damage (halved).

The Dragon can NOT use Reactions or Legendary Actions during this attack.

Petrifying Breath (Recharge 5–6). The dragon exhales an opaque cloud of smoke in a 90-foot cone. Each creature in that area must make a DC 20 Constitution saving throw. On a failed save, the targets speed is reduced to 0 and will be petrified after 2 turns. The target may repeat the saving throw at the end of each of its turn to end the effect. 

Spells

Mold Earth. Casting Time: 1 Action; Range/Area: 30 feet; Components: V; Duration: Instantaneous or 1 hour

       The dragon reshapes earth and stone within a 20-foot cube. It enables instant excavation and movement of loose earth, creation of temporary visual designs on the surface, and the alteration of terrain to hinder or ease movement. The spell’s effects can be instant or last for up to an hour, but only two non-instantaneous effects can be active simultaneously.

Thunderclap. Casting Time: 1 Action; Range/Area: 5 feet; Components: S; Duration: Instantaneous 

       The dragon creates a burst of thunderous sound that can be heard up to 100 feet away. Each creature within range, other than you, must succeed on a DC 19 Constitution saving throw or take 2d6 thunder damage.

Detect Thoughts (1/day). Casting Time: 1 Action; Range/Area: Self; Components: V,S; Duration: Concentration, up to 1 minute. 

        For the duration, you can read the thoughts of certain creatures. When you cast the spell and as your action on each turn until the spell ends, you can focus your mind on any one creature that you can see within 30 feet of you. If the creature you choose has an Intelligence of 3 or lower or doesn’t speak any language, the creature is unaffected.

       You initially learn the surface thoughts of the creature—what is most on its mind in that moment. As an action, you can either shift your attention to another creature’s thoughts or attempt to probe deeper into the same creature’s mind. If you probe deeper, the target must make a DC 19 Wisdom saving throw. If it fails, you gain insight into its reasoning (if any), its emotional state, and something that looms large in its mind (such as something it worries over, loves, or hates). If it succeeds, the spell ends. Either way, the target knows that you are probing into its mind, and unless you shift your attention to another creature’s thoughts, the creature can use its action on its turn to make an Intelligence check contested by your Intelligence check; if it succeeds, the spell ends.

       Questions verbally directed at the target creature naturally shape the course of its thoughts, so this spell is particularly effective as part of an interrogation.

       You can also use this spell to detect the presence of thinking creatures you can’t see. When you cast the spell or as your action during the duration, you can search for thoughts within 30 feet of you. The spell can penetrate barriers, but 2 feet of rock, 2 inches of any metal other than lead, or a thin sheet of lead blocks you. You can’t detect a creature with an Intelligence of 3 or lower or one that doesn’t speak any language.

       Once you detect the presence of a creature in this way, you can read its thoughts for the rest of the duration as described above, even if you can’t see it, but it must still be within range.

 Earth Tremor (1/day). Casting Time: 1 Action; Range/Area: Self (10-foot-radius); Components: V,S; Duration: Instantaneous

       Create a localized earthquake, affecting creatures within a 10-foot radius. Targets in the area must make a DC 19 Dexterity saving throw or suffer 3d6 bludgeoning damage and be knocked prone. Additionally, the spell transforms loose earth or stone into difficult terrain, hindering movement until cleared.

Dust Devil (1/day). Casting Time: 1 Action; Range/Area: 60 feet; Components: V,S; Duration: Concentration, up to 1 minute.

       Summon a small whirlwind that can deal damage and push creatures away. Any creature ending its turn within 5 feet of the dust devil faces a DC 19 Strength saving throw, taking 2d6 bludgeoning damage and being pushed back 10 ft on a failed save. The spell also includes the unique ability to move the dust devil and create a cloud of debris in certain terrains, obscuring visibility. Moving the Dust Devil requires 1 Action.

Fear (1/day). Casting Time: 1 Action; Range/Area: Self (30-foot-Cone); Components: V,S; Duration: Concentration, up to 1 minute.

        Each creature in a 30-foot Cone must succeed on a DC 19 Wisdom saving throw or drop whatever it is holding and have the Frightened condition for the duration.

       A Frightened creature takes the Dash action and moves away from the dragon by the safest route on each of its turns unless there is nowhere to move. If the creature ends its turn in a space where it doesn’t have line of sight to the dragon, the creature makes a DC 19 Wisdom saving throw. On a successful save, the spell ends on that creature.

 Destructive Force (1/day). Casting Time: 1 Action; Range/Area: Self (30-foot-radius); Components: V; Duration: Instantaneous 

       The dragon strikes the ground, creating a burst of energy that ripples outward from it. Each creature the dragon chooses within 30 feet of it must succeed on a DC 19 Constitution saving throw or take 5d6 thunder damage, as well as 5d6 force damage, and be knocked prone. A creature that succeeds on its saving throw takes half as much damage and isn’t knocked prone.

Earthquake (1/day). Casting Time: 1 Action; Range/Area: 500 feet; Components: V,S; Duration: Concentration, up to 1 minute.

       Trigger a massive tremor affecting a 100-foot-radius. This seismic event turns the ground into difficult terrain and disrupts concentration, requiring a DC 19 Constitution saving throw from affected creatures. Additionally, creatures must make a DC 19 Dexterity saving throw each turn to avoid being knocked prone. The spell can open fissures and damage structures, potentially causing them to collapse, posing significant risks to creatures nearby. Specific terrain effects and structural damages are at the DM’s discretion.

Power Word Stun (1/day). Casting Time: 1 Action; Range/Area: 60 feet; Components: V; Duration: Instantaneous

        You speak a word of power that can overwhelm the mind of one creature you can see within range, leaving it dumbfounded. If the target has 150 hit points or fewer, it is stunned. Otherwise, the spell has no effect.

       The stunned target must make a DC 19 Constitution saving throw at the end of each of its turns. On a successful save, this stunning effect ends.

Stone Shift. The dragon commands the earth itself to instantly move it 40 ft. to an unoccupied space. The dragon ignores all opportunity of attacks.

Greater Stone Endurance (3/Day). The Dragon shrouds their unyielding stone wings in a magical aura. If the Dragon is hit, with an attack it can see, it may use its reaction to halve the damage dealt to it.

Impenetrable Shield (2/day). An impenetrable wall of earth bursts from the ground protecting the dragon. Until the start of the dragon's next turn, they have a +5 bonus to their AC, including against the triggering attack, and they take no damage from magic missile. 

Counterspell. The dragon attempts to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect. If it is casting a spell of 4th level or higher, make an ability check using the dragon's spellcasting ability. The DC equals 10 + the spell's level. On a success, the creature's spell fails and has no effect.

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. The dragon makes a Wisdom (Perception) check.

Tail, Claw, Bite Attack, Cantrip. The dragon can use either a Tail attack, Claw attack, Bite Attack, or Cantrip.

Trampling Dance (cost 2 Legendary Actions). The dragon shakes the ground and summons a gust of wind, as it thrashes about while whirling its wings in a mesmerizing dance. Each creature within 10 feet of the dragon must succeed on a DC 22 Dexterity saving throw. Creatures that fail the save are launched back 30 ft. taking 19 (4d6 + 10) bludgeoning damage and are knocked prone.