Charge. If the unicorn moves at least 20 ft. 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:
At will: detect evil and good, druidcraft, pass without trace
1/day each: calm emotions, dispel evil and good, entangle
Magic Resistance. The unicorn has advantage on saving throws against spells and other magical effects.
Magic Weapons. The unicorn's weapon attacks are magical.
Healing Touch. 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.
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.
Multiattack. The unicorn makes two attacks: one with its hooves and one with its horn.
Teleport. The unicorn magically teleports itself and up to three willing creatures it can see within 5 ft. of it, along with any equipment they are wearing or carrying, to a location the unicorn is familiar with, up to 1 mile away.
Heal Self. The unicorn magically regains 11 (2d8 + 2) hit points.
Hooves. The unicorn makes one attack with its hooves.
Shimmering Shield. The unicorn creates a shimmering, magical field around itself or another creature it can see within 60 ft. of it. The target gains a +2 bonus to AC until the end of the unicorn's next turn.