Waterbending

You can control water. The water can hit and grab people to do damage and restrain. 

People can still drink the water you bend. When attacking by throwing someone against something the person must make an AC 15 strength saving throw. This attack does 1d10 damage at level 1 and increases by 1d10 at levels 5,11,17,20

At level 11 you can form ice which has an AC of 12 and has 8 HP when being used as a defensive wall. when attacking with ice spears or ice discs it does 2d10 piercing damage which increases by 1d10 at all the same levels as your normal bending. When forming a wall in battle you can do it when you learn weather someone is attacking you.

When grabbing someone they must succeed on a DC 15 strength saving throw, or they are restrained.