Blessing of Tyr. Acateus and any good alligned creature it chooses that is riding him are under the effect of the protection from evil and good spell while Acateus is not incapacitaded.

 Charge (Recharge 6). If Acateus moves at least 20 feet straight toward a target an then hits it with a horn attack, the target takes an extra 9 (2d8) piercing damage. If the target is a creature it must make a DC 14 Strenght saving throw or be knocked prone.

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

Magic Weapons. Acateus weapon attacks are magical.

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

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Horn. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 4) piercing damage plus 4 (1d8) radiant damage.

Horn of Justice (Recharge 6). Acateus horn flares into a holy nova in a 30 foot sphere centered on himself. All allied creatures within this sphere regain 16 (3d10) hit points each while any creatures hostile to Acateus must succeed on a DC 13 Charisma saving throw or take 16 (3d10) radiant damage. Fiends and undead creatures make this saving throw with disadvantage.