You are size small.

You have a walking speed of 25 ft.

You cannot swim and you sink to the bottom of any body of water you find yourself in. You can be pulled out of water rather easily by your party members. 

Additionally, you do not need to breathe and can just walk along the ocean floor without any repurcussions.

You have a natural armour class of 12. This stacks with armour.

You have a magical antenna placed upon your head. You can sense any and all magical things within 15 ft of you.

You gain +2 to your Constitution modifer and you are proficient with one tool and skill of your choice.