Might of the Tyrannosaurus Rex

You have developed traits similar to that of a Tyrannosaurus Rex, granting you the following benefits:

Ability Score Improvement. Increase your Strength or Constitution by 1, to a maximum of 20.

Maw of the Tyrannosaurus. As a bonus action, you can cause your mouth to transform into the jaws of a tyrannosaurus rex, for 1 minute. You can use this as a natural weapon, that uses your Strength modifier for attack and damage rolls and deals 1d12 piercing damage. When you reach 11th level, this damage increases to 2d12. Once you have used this feature you can't use it again until you finish a long rest.