Corpse Juggernaut

Siege Monster. The corpse juggernaut does double damage to objects and structures.

Horrific charge. If the corpse juggernaut moves at least 20 feet straight and then hits with a gore attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. The corpse juggernaut then uses its Frightful Presence.   

 Multiattack. The corpse juggernaut uses its frightful presence. It then makes three Slam attacks.

Slam. Melee Weapon Attack: +9 to hit, reach 10 ft.,one target. Hit: 15 (2d8 + 5 ) bludgeoning damage. 

Gore. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 21 (3d10 + 5) piercing damage.

Frightful Presence. Each creature within 60 feet of the corpse juggernaut and aware of it must succeed on a DC 14 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the corpse juggernaut's Frightful presence for 24 hours.

Fetid Exhalation (Recharge 5-6). The corpse juggernaut exhales a fetid air in a 15-foot sphere centered on itself. Each creature in that area must make a DC 17 Constitution saving throw, taking 40 (10d8) necrotic damage on a failed save, or half as much damage on a successful one.

The corpse juggernaut 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 corpse juggernaut regains spent legendary actions at the start of its turn.

Horrific Charge (Costs 2 Actions). The corpse juggernaut moves up to 20 feet towards an enemy, and makes a gore attack.

Slam (Costs 1 Action). The corpse juggernaut makes a slam attack.