Crabicus Giganticus

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

Magic Resistance. The Crabicus Giganiticus has advantage on saving throws against spells and other magical effects.

Reflective Carapace. Any time the Crabicus Giganticus is targeted by a magic missile spell, a line spell, or a spell that requires a ranged attack roll, roll a d6. On a 1 to 5, the Crabicus Giganticus is unaffected. On a 6, the Crabicus Giganticus is unaffected, and the effect is reflected back at the caster as though it originated from the Crabicus Giganticus, turning the caster into the target.

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

Multiattack. The Crabicus can use its Frightful Presence. It then makes five snip attacks with its claws.

Snip. Melee Weapon Attack: +19 to hit, reach 15ft., one target. Hit: 28 (4d8 + 10) slashing damage.

Big Claw. Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: 36 (4d12 + 10) piercing damage. If the target is a creature, it is Grappled (escape DC 20). Until this grapple ends, the target is Restrained, and the Crabicus can't big claw another target.

Frightful Presence. Each creature of the Crabicus' choice within 120 feet of it and aware of it must succeed on a DC 17 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, with disadvantage if the Crabicus is within line of sight, 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 Crabicus' Frightful Presence for the next 24 hours.

Snap. The Crabicus makes one big claw attack against a Large or smaller creature it is grappling. If the attack hits, the target takes 56 (16d6) piercing damage, if this reduces a creatures health to zero its body is torn asunder and dies. releasing it from the grapple

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

Attack. The Crabicus makes one snip attack

Scuttle. The Crabicus moves up to half its speed.

VIce Grip. (Costs 2 Actions).The Crabicus makes one Big Claw or uses its Snap.