Trampling Charge: If the bulvak moves at least 20 ft straight towards any creature and then hits it with a ram attack on the same turn, that target must succeed a DC 13 Strength saving throw or be knocked prone. If the target is prone, the bulvak can make one stomp attack against it as a bonus action.
Unrelenting: If the damage reduces the bulvak to 0 hit points, it must make a Consitution saving throw with a DC of 5 + the damage taken unless the damage is fire or from a Critical Hit. On a success, the Bulvak drops to 1 hit point in its stead.
Antler: Melee weapon attack +5 to hit 5 ft reach to one target - 1d8+3 bludgeoning damage
Hoof: Melee weapon attack +5 to hit, 5 ft reach to one target - 2d6+3 bludgeoning damage
Attack Opportunity: use of 1 melee strike