Multiattack

The unicorn attacks once with its hooves and once with its horn.

Hooves

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) bludgeoning damage.

Horn

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 5) piercing damage plus 10 (3d6) radiant damage. If the target is a creature and the unicorn moves at least 20 feet straight towards the target before the attack the target takes an extra 9 (2d8) bludgeoning damage and makes a DC 16 Strength saving throw falling prone on a failure.

Grant Boon (3/Day)

The unicorn touches a willing creature including itself with its horn and grants one of the following boons:

Healing: The creature magically regains 21 (6d6) hit points

It is cured of all diseases and poisons affecting it are neutralized.

Luck: During the next 24 hours, the creature can roll a d12 and add the result to one ability check, attack roll, or saving throw after seeing the result

Protection: A glowing mote of light orbits the creatures head

The mote lasts 24 hours. When the creature fails a saving throw it can use its reaction to expend the mote and succeed on the saving throw.

Resolution: The creature is immune to being charmed or frightened for 24 hours