Adult Sasabie

Grappler. The sasabie has advantage on attack rolls against any creature grappled by it.

Legendary Resistance (3/day). If the sasabie fails a saving throw, it can choose to succeed instead.

Siege Monster. The sasabie deals double damage to objects and structures.

Sure-Footed. The sasabie has advantage on Strength and Dexterity saving throws against effects that would knock it prone.

Multiattack.  The sasabie makes three attacks: one with its bite or horns, and two with its claws. 

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 25 (3d12 + 6) piercing damage plus 5 (2d4) necrotic damage, and the target must succeed on a DC 18 Constitution saving throw or become poisoned for 1 minute.

Claws. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 19 (3d8 + 6) slashing damage, and the target is grappled (escape DC 18). The sasabie has two claws, each of which can grapple only one target. The sasabie can choose to use both claws to grapple the same target if it is a Medium or smaller creature. If the target is grappled in this way, the target is restrained and the sasabie can't claw another target until the grapple ends. 

Horns. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 16 (3d6 + 6) piercing damage. If the sasabie moved at least 20 feet straight toward the target of this attack in the same turn, the target must succeed on a DC 18 Strength saving throw or be knocked prone. If the target is knocked prone in this way, the sasabie may make one stomp attack against it as a bonus action.

Stomp. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 22 (3d10 + 6) bludgeoning damage.

The sasabie can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The sasabie regains spent legendary actions at the start of its turn.

Attack. The sasabie makes one claw or stomp attack.

Move. The sasabie moves up to one-third its speed.

Chomp (costs 2 actions). The sasabie makes one bite attack.