Bicorn

Charge. If the bicorn moves at least 20 feet 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 bicorn'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, disguise self,druidcraft

1/day each: confusion, dispel evil and good, [Tooltip Not Found]

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

Magic Weapons. The bicorn's weapon attacks are magical.

Multiattack. The bicorn makes two attacks: one with its hooves and one with its horn.

Hooves. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Horns. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 8 (2d8 + 4) piercing damage.

Poison Touch (2/Day). The bicorn touches another creature with its horn. The target takes 10 (2d8) poison damage, and the target must succeed on a DC 15 Constitution saving throw or be poisoned until the end of its next long rest. Until this poison ends, the target is deafened. The target can repeat the saving throw at the end of each of its short rests, ending the poison on itself on a success.

Teleport (1/Day). The bicorn magically teleports itself and up to three willing creatures it can see within 5 feet of it, along with any equipment they are wearing or carrying, to a location the bicorn is familiar with, up to 1 mile away. 

The bicorn can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The bicorn regains spent legendary actions at the start of its turn.

Hooves. The bicorn makes one attack with its hooves.

Baneful Smog (Costs 2 Actions). The bicorn creates a hazy, magical field around another creature it can see within 60 feet of it. Whenever the target makes an attack roll or saving throw, until the end of the bicorn's next turn, the target must subtract 2 from the attack roll or saving throw. 

Siphoning Stab (Costs 3 Actions). The bicorn makes one attack with its horns. On a hit, the target takes an addition 12 (3d6) poison damage, and the bicorn regains hit points equal to half the amount of poison damage dealt.