Aspect of Aquilarii

Charge. If the elacorn moves at least 20 feet before hitting a target with a Horn attack, the target takes an extra 5 (1d10) piercing damage. If the target is a Medium or smaller creature, it must succeed on a DC: 15 Strength saving throw or be knocked prone.

Fey Nature. The elacorn's attacks are magical, and it does not suffer any movement penalty from difficult terrain imposed by a forest or swamp. Additionally, the elacorn can innately cast the spell pass without trace one time per being summoned.

Horn. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (1d10 + 5) piercing damage.