Amethyst Horse

Amethyst Resilience: The Amethyst Horse has advantage on saving throws against spells and effects related to necrotic or Blighted energy.

Innate Intelligence: The Amethyst Horse understands Common and Sylvan and can respond to telepathically within a 60-foot radius, though it cannot speak aloud.

Blight Resistance Aura: All creatures within 10 feet of the Amethyst Horse have resistance to necrotic damage and Blighted Scourge energy while within the aura.

 Hoof Strike: Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 20 (3d10 + 4) bludgeoning damage.

 Amethyst Charge: If the Amethyst Horse moves at least 20 feet straight toward a target and then hits it with a Hoof Strike on the same turn, the target must succeed on a DC 15 Strength saving throw or be knocked prone. If the target is prone, the Amethyst Horse can make another Hoof Strike against it as a bonus action.

 Amethyst Burst (Recharge 6): The Amethyst Horse releases a burst of radiant energy in a 15-foot radius around it. Each creature in that area must make a DC 15 Constitution saving throw, taking 30 (6d8) radiant damage on a failed save, or half as much damage on a successful one. Blighted creatures in this radius automatically take full damage.

Size Shift: As a bonus action, the Amethyst Horse can change its size between Large and Medium. While Medium, it appears as a normal horse. While Large, its true form is revealed, with shimmering amethyst-colored fur and a more powerful physique. This ability lasts until the horse decides to revert back to its original form (no action required).

Fey Step (Recharge 5-6): As a bonus action, the Amethyst Horse can teleport up to 30 feet to an unoccupied space it can see. It can also bring along a rider or creature it is carrying.