Colláis

Impale and Toss. When the colláis hits a Medium or smaller creature with a gore attack, it can use a bonus action to impale and toss the creature. The target must succeed on a DC 16 Strength saving throw or take 11 (2d10) piercing damage and be flung up to 10 feet away from the colláis in a random direction and knocked prone.

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

Multiattack. The colláis makes one gore attack and two hooves attacks.

Gore. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage.

Hooves. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage.

Cry of the Forest. The colláis sounds a dreadful and reverberating call. Each creature within 100 feet of the colláis that can hear the cry must succeed on a DC 16 Charisma saving throw or be frightened until the end of its next turn. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the colláis's Cry of the Forest for the next 24 hours. Forest-dwelling beasts and monstrosities with an Intelligence of 4 or lower automatically succeed or fail on this saving throw, the colláis's choice.