Brutloc

Charge. If the brutloc moves at least 20 ft. straight toward a target and then hits it with a horn attack on the same turn, the target takes an extra 21 (6d6) piercing damage. If the target is a creature, it must succeed on a DC 18 Strength saving throw or be knocked prone. 

Deafening wings. The brutloc's wings produce a deafening sound, creatures within 30 ft. of the brutloc have disadvantage on perception checks taht rely on sound. If a creature that is concentrating on a spell starts its turn in this area, they must succeed on a DC 13 Constitution saving throw or lose concentration. 

Multiattack. The brutloc makes five attacks: one with its horn, and four slam attacks.

Horn. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 22 (5d6 + 5) piercing damage. 

Slam. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 10 (1d10 + 5) bludgeoning damage.