Designer's Note: Once per battle round, you can use a Tidal ability from either the Tides of the Sea or the Tides of the Storm. If you do so, you unlock the next ability in the same set in the next battle round. You can switch sets at any time, though this resets your progress. For example, if you use the 'Concealing Tide' ability in the first battle round, in the second, you can either use 'Swift Tide' or switch sets and use 'Unpredictable Tide'.