Your Intelligence score increases by 1, and your Charisma score increases by 2.

Tieflings mature at a slower rate than humans and live a few years longer.

The Water Tiefling can breathe in both air and water.

While in direct sunlight, the Water Tiefling has disadvantage on Wisdom (Perception) checks that rely on sight.

Tieflings are about the same size and build as humans, but most grow to be shorter than humans. Your size is Medium.

Your base walking speed is 20 feet.

Thanks to your infernal heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You know the thaumaturgy cantrip. When you reach 3rd level, you can cast the hellish rebuke spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the darkness spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

You can speak, read, and write Aquan, Common, and Infernal.