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Large celestial, lawful good
Charge. If the unicorn moves at least 20 feet straight toward a target and then hits it with a horn attack on the same turn, the target takes an extra 9 (2d8) piercing damage. If the target is a creature, it must succeed on a DC 15 Strength saving throw or be knocked prone.
Innate Spellcasting. The unicorn's innate spellcasting ability is Charisma (spell save DC 14). The unicorn can innately cast the following spells, requiring no components:
Magic Resistance. The unicorn has advantage on saving throws against spells and other magical effects.
Magic Weapons. The unicorn's weapon attacks are magical.
Multiattack. The unicorn makes two attacks: one with its hooves and one with its horn.
Hooves. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.
Horn. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage.
Healing Touch (3/Day). The unicorn touches another creature with its horn. The target magically regains 11 (2d8 + 2) hit points. In addition, the touch removes all diseases and neutralizes all poisons afflicting the target.
Teleport (1/Day). The unicorn magically teleports itself and up to three willing creatures it can see within 5 feet of it, along with any equipment they are wearing or carrying, to a location the unicorn is familiar with, up to 1 mile away.
The unicorn 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 unicorn regains spent legendary actions at the start of its turn.
Hooves. The unicorn makes one attack with its hooves.
Unicorns dwell in enchanted forests. Unrelated to the horses it resembles, a unicorn is a celestial creature that wanders sylvan realms, its white form glimmering like starlight.
Divine Guardians. Good deities placed unicorns on the Material Plane to ward away evil and preserve and protect sacred places. Most unicorns protect a bounded realm such as an enchanted forest. However, the gods sometimes send a unicorn to guard sacred artifacts or protect specific creatures. When the forces of darkness strike against an individual the gods wish to protect, they might send that individual to a unicorn's forest, where evil creatures pursue at their peril.
Forest Lords. A unicorn's forest is a celestial realm where nothing that occurs beneath the sun-dappled leaves escapes the creature's notice. A unicorn hears each breathy tune sung by the elves that reside amid the treetops. It senses where every caterpillar spins its cocoon, each leaf and branch upon which a bright butterfly rests its tired wings.
Sacred Horns. A unicorn's horn is the focus of its power, a shard of divine magic wrought in spiraling ivory. Wands of unicorn horn channel powerful magic, while unicorn horn weapons strike with divine force. Wizards can work powdered unicorn horn into potent potions and scroll ink, or use it as a component in eldritch rituals. However, any creature that takes a role, no matter how small, in slaying a unicorn is likely to become the target of divine retribution.
Blessed Mounts. When darkness and evil threaten to overwhelm the mortal world, the gods sometimes see fit to pair a unicorn mount with a champion. A paladin astride a unicorn is a sign of the gods' direct intervention in the affairs of the mortal realm. It is a holy alliance made to cleave the heads from demons and banish devils back to the Nine Hells.
A Unicorn's Lair
A unicorn's lair might be an ancient ruin overgrown with vines, a misty clearing surrounded by mighty oaks, a flower-covered hilltop alive with butterflies, or some other serene woodland location.
Transformed by the creature's celestial presence, the domain of a unicorn might include any of the following magical effects:
If the unicorn dies, these effects end immediately.