You have darkvision, out to a range of 30 feet.

You have proficiency  on athletic checks, animal handling checks, and perception checks.

Harder scales allow you to gain a +4 to your AC.

You can deliver a devastating bite, dealing 1d6+str piercing damage, along with this you can attack with your tail as a bonus action, dealing 1d4 bludgeoning.

You know where the nearest body of water is and gain advantage on the first attack you make on your turn while within five feet of a body of water.

You can breath in land and water.

Immediately after you bite you can preform the death roll, if you do spend half of your walking movement and force the creature to make a dexterity save (save dc 10+str). If they fail a limb of your choice gets crippled or torn off, dealing an additional 2d6 bludgeoning that ignores resistance and immunities. If they succeed the save they can use their reaction to grapple you. You can use this feature a number of times equal to your proficiency bonus, resetting on a short rest.

Increase One score by two and a different score by one.