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.