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

 Legendary shell. When incapacitated or paralysed it withdraws into its shell as a Natural body function gaining +5 to AC untill it emerges back it has advantage on Strength and Constitution saving throws. While in it's shell, it's prone, it's speed is 0 and can't increase.it has disadvantage on Dexterity and Sight depending  saving throws.Any attack on the Eggsy is made at advantage while it's withdrawn, it can't emerge out untill it passes the saving throws required to end incapacitated or paralysed condition. On its turn it can only make saving throws or use Scintillating shell while withdrawn.

Multiattack. The Eggsy can use its Chaos Roar. It then makes three attacks: one with its Force Sword and two with its claws.

Force sword . Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 7 (2d6) force damage

Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) slashing damage.

Tail. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.

Chaos Roar. Each creature of the Eggsys's  choice that is within 120 feet of the Eggsys  and is aware of Eggsys 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, 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 Eggsys's Frightful Presence for the next 24 hours.

Shell Effects (Recharge 5–6).  Eggsys uses one of the following Shell Effects 

 Magical Spike burst(2 charges): Eggsy uses both his  action to  from magically enchanted force spikes on his shell and bonus action to hurl them at his enemy, far or close by making a Melee or Ranged Weapon Attack: +12 to hit, reach 5 ft. or range 30/60 ft., One target. Hit:6 (1d4 + 4) piercing damage in melee, or 6 (1d4 + 4) piercing damage at range, plus 12 (6d6) force damage. If the target is a creature, and it suffers a lingering wound that causes it to take 6(2d6) force  damage at the start of each of its turns, it will also heal Eggsy by 3(2d6) at start of his turn. The wound ends if the target regains hit points or if a creature uses an action to tend and pick the spike out of the wound, which requires a successful DC 17 Wisdom check.  

Scintillating Shell: the shell sheds bright light in a 20-foot parallel to his shell  and dim light for an additional 30 feet, and creatures that can see the Shell have disadvantage on attack rolls against it. In addition, any creature within the bright light and able to see the shell when this power is activated must succeed on a DC 18 Wisdom saving throw or take stunned untill the light ends.

Shelled Retribution(3 charges): The shell on a reaction captures half of the Three incoming attacks energy sending it back at the attacker with extra 1d8 force dmg, on a failed Dex save of DC 17 from the attacker and none on a successful save.Eggsy also gain resistance to the triggering damage type until the start of it's next turn. 

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

Detect. The Eggsy makes a Wisdom (Perception) check.

Tail Attack. The Eggsy makes a tail attack.

Shell Force Tremour (Costs 2 Actions). The Charges up the ground with Force energy and a fountain of churned earth and stone erupts in a 20-foot cube centered around Eggsy. Each creature within that area must succeed on a DC 20 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. The Eggsy can then walk/climb upto half it's climbing/walking speed.