Might of the Tides

Once per Long Rest, the character may call upon the unbridled power of the tides to knock their enemies off their feet. As a Bonus Action, the character utters a word in Primordial that conjures a ring of sea water to burst out in a 10 foot radius, centered upon the character. All creatures within 10 feet of the character must succeed on a Strength save against the Characters Spell Save DC (using Charisma as the governing stat) or be knocked prone. The character is immune to this effect and may choose a number of creatures equal to their Proficiency Bonus who automatically succeed on their saving throw.