Unicorn

Legendary Resistance. If the unicorn fails a saving throw, it can choose to succeed instead.

Magic Resistance. The unicorn has Advantage on saving throws against spells and other magical effects.

Multiattack. The unicorn makes one Hooves attack and one Radiant Horn attack.

Hooves. Melee Attack Roll: +7, reach 5 ft. Hit: 11 (2d6 + 4) Bludgeoning damage.

Radiant Horn. Melee Attack Roll: +7, reach 5 ft. Hit: 9 (1d10 + 4) Radiant damage.

Spellcasting. The unicorn casts one of the following spells, requiring no spell components and using Charisma as the spellcasting ability (spell save DC 14):

Charging Horn. The unicorn moves up to half its Speed without provoking Opportunity Attacks, and it makes one Radiant Horn attack.

Shimmering Shield. The unicorn targets itself or one creature it can see within 60 feet of itself. The target gains 10 (3d6) Temporary Hit Points, and its AC increases by 2 until the end of the unicorn’s next turn. The unicorn can’t take this action again until the start of its next turn.