Corrupted Unicorn

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

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.

Trample. The unicorn attacks a prone creature with its hooves.

Darkness Aura (1/Day). A 15-foot radius area of magical darkness emanates from the unicorn spreading around corners and moving with it. Darkvision and natural light can't penetrate it. If the darkness overlaps with an area of light created by a 2nd-level spell or lower the spell creating the light is dispelled. The darkness aura lasts for 10 minutes or until the unicorn takes damage. The aura doesnt hinder the unicorns sight.

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.