Avalux

Variant: Dragons as Innate Spellcasters. Dragons are innately magical creatures that can master a few spells as they age. Using this variant a young or older dragon can innately cast a number of spells equal to its Charisma modifier. Each spell can be cast once per day, requiring no material components, and the spell's level can be no higher than one third the dragon's challenge rating (rounded down). The dragon's bonus to hit with spell attacks is equal to its proficiency bonus + its Charisma modifier. The dragon's spell save DC equals 8 + its proficiency bonus + its Charisma modifier.

(4) 3rd level spells, Charisma (+4), Proficiency +4, 

Spell attack: +8, Spell save: 16

Antagonize:  Range: 30 feet

• You whisper magical words that antagonize one creature of your choice within range. The target must make a Wisdom saving throw. On a failed save, the target takes 4d4 psychic damage and must immediately use its reaction to make a melee attack against another creature of your choice that you can see. If the target can’t make this attack (for example, because there is no one within its reach or because its reaction is unavailable), the target instead has disadvantage on the next attack roll it makes before the start of your next turn. On a successful save, the target takes half as much damage only.

Counterspell, Range: 60 feet

• You attempt 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 your spellcasting ability. The DC equals 10 + the spell’s level. On a success, the creature’s spell fails and has no effect.

Fear, Range: Self (30-foot cone), Duration: Concentration, up to 1 minute

• You project a phantasmal image of a creature’s worst fears. Each creature in a 30-foot cone must succeed on a Wisdom saving throw or drop whatever it is holding and become frightened for the duration.
• While frightened by this spell, a creature must take the Dash action and move away from you by the safest available route on each of its turns, unless there is nowhere to move. If the creature ends its turn in a location where it doesn’t have line of sight to you, the creature can make a Wisdom saving throw. On a successful save, the spell ends for that creature.

Major Image, Range: 120 feet, Duration: Concentration, up to 10 minutes

• You create the image of an object, a creature, or some other visible phenomenon that is no larger than a 20-foot cube. The image appears at a spot that you can see within range and lasts for the duration. It seems completely real, including sounds, smells, and temperature appropriate to the thing depicted. You can’t create sufficient heat or cold to cause damage, a sound loud enough to deal thunder damage or deafen a creature, or a smell that might sicken a creature (like a troglodyte’s stench).
• As long as you are within range of the illusion, you can use your action to cause the image to move to any other spot within range. As the image changes location, you can alter its appearance so that its movements appear natural for the image. For example, if you create an image of a creature and move it, you can alter the image so that it appears to be walking. Similarly, you can cause the illusion to make different sounds at different times, even making it carry on a conversation, for example.
• Physical interaction with the image reveals it to be an illusion, because things can pass through it. A creature that uses its action to examine the image can determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC. If a creature discerns the illusion for what it is, the creature can see through the image, and its other sensory qualities become faint to the creature.

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 5 (1d10) lightning damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Lightning Breath (Recharge 5–6). The dragon exhales lightning in an 60-foot line that is 5 feet wide. Each creature in that line must make a DC 16 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.