Clockwork Nautilus

Clockwork Heart When the clockwork nautilus is reduced to 0 hitpoints, it can make a DC 10 Constitution saving throw regaining 1 hitpoint on a success. For each success, the DC increases by 5. The DC resets after a short or long rest.

Construct Nature The clockwork nautilus does not need to eat, breathe, or sleep

False Appearance While motionless, the clockwork nautilus is indistinguishable from a statue

Immutable Form The clockwork nautilus is immune toany effects or magic that would alter its form

Internal Clock The clockwork nautilus has advantage oninitiative checks.

Underwater Propulsion The clockwork nautilus can move through difficult terrain caused by underwater effects and can move through these conditions without expending additional movement.

Multiattack. The clockwork nautilus can make four attacks with its Charged Tentacles. It can replace a charged tentacle for a Fling attack

Charged Tentacles. Melee Weapon Attack, +9 to hit,reach 20ft, one target. Hit: 16 (2d10+5) bludgeoning damage + 9(2d8) lightning damage. On a hit, Medium or smaller creatures are grappled and restrained (escape DC 17).

The clockwork nautilus can only grapple up to 8 creatures at a time in this manner.

Fling One Large or smaller object held or creature grappled by the clockwork nautilus is thrown up to 60 feet in a random direction and knocked prone. If a thrown target strikes a solid surface, the target takes 3(1d6) bludgeoning damage for every 10 feet it was thrown. If the target is thrown at another creature, that creature must succeed on a DC 17 Dexterity saving throw or take the same damage and be knocked prone.

Deep Sea Weaponry(Recharge 5-6)
The clockwork dragon has a variety of deep sea weaponry that is can use to adapt to any situation. When its deep sea weaponry is available, it can use one of the following options.

Electrocute (Recharge 5-6)
Creatures grappled by the clockwork nautilus must succeed a DC 13 Constitution saving throw or take 36 (8d8) lightning damage and become paralyzed for one minute.
Paralyzed creatures can repeat its saving throw at the end of each of its turns to end the effect on a success.

Steam Cannon(recharge 5-6) Creatures in a 120ft. long and 10ft. wide line must succeed a DC 17 Dexterity saving throw. On a failed saving throw, creatures take 28(8d6) fire damage and half as much on a success. This fire damage is not reduced from being underwater. Upon using this feature, the clockwork nautilus can move up 30ft. without provoking attacks of opportunity

Whirlpool (Recharge 5-6) Creatures in a 30ft. radius around the clockwork nautilus must succeed a DC 17 Strength saving throw. On a failed saving throw, creatures are pulled or pushed(choose one) 30ft. and take 22 (4d10) bludgeoning + 22 (4d10) slashing damage. On as successful saving throw, creatures take half damage and are otherwise unaffected.

Propulsion While underwater, the clockwork nautilus can use its bonus action to Dash

Reactive The clockwork nautilus can take a reaction atthe end of each of its turns