Swimmer

Movement in water is second nature to you. You gain the following benefits:

• You gain a swim speed of 30 ft.
• You gain advantage on Constitution checks made to hold your breath.
• You gain advantage on Strength checks made while submerged or treading water.
• While swimming, when you make a melee attack against a creature, you don't provoke opportunity attacks from that creature for the rest of the turn, whether you hit or not.