Argentinosaurus Huinculensis

Multiattack. The argentinosaurus makes two attacks: one with its slam and one with its tail. It can't make both attacks against the same target.

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 20 (2d12 + 7) bludgeoning damage, and the target must succeed on a DC 24 Strength saving throw or be knocked prone.

Tail. Melee Weapon Attack: +10 to hit, reach 20 ft., one target. Hit: 25 (4d8 + 7) bludgeoning damage, and the target must succeed on a DC 18 Strength saving throw or be knocked prone.

Stomp. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 85 (12d12 + 7) bludgeoning damage.

Brutal Crush. The argentinosaurus can make one stomp attack against any prone target as a bonus action.