Dragon Tortle Lineage

Unlike a normal tortle your DNA is infused with that of a dragon turtle and has taken on a physical form to resemble that of one and has afforded you great powers. Your size is Large, your natural armor is 18, your HP is increased by 3 points per character level,  you have a 40ft swim speed, darkvision 60ft, your melee attacks made with your body count as magical and your strength score is increased by 6. Multiattack: You can make 3 Claw attacks / 1 Bite or Tail attack and 2 Claw attacks / 1 Bite and 1 tail attack.

Actions 

 Bite. Melee Weapon Attack: +STR+PB to hit, reach 10ft., one target. Hit:  2d12 + STR piercing damage. If the target is a creature it is grappled.

Claw. Melee Weapon Attack: +STR+PB to hit, reach 5 ft., one target. Hit:  2d8 +STR  slashing damage.

Tail. Melee Weapon Attack: +STR+PB to hit, reach 15 ft., one target. Hit:  2d12 +STR bludgeoning damage. If the target is a creature, it must succeed on a DC 18 Strength saving throw or be  knocked prone.

Shell Defense. You no longer go prone, your walking speed is halfed, you make dexterity saving throws with constitution instead, you can take reactions, and you can do any action that is not casting a spell. 

Steam Breath (Recharge 9-10). You exhale scalding steam in a 30-foot cone. Each creature in that area must make a DC 18 Constitution saving throw, taking  (9d6) fire damage on a failed save, or half as much damage on a successful one. Being underwater doesn't grant resistance against this damage.

D.Tortle Dominion - 1/Long Rest  As a action Project a 120ft.H, 80ft.W cylinder whirlpool of water centered on yourself, creatures other than you caught in the area must make a strength saving throw or be pulled 15ft towards the center. last 8 hours. As a Bonus action you can move the whirlpool and all creatures in it 40ft in any direction except into the air.