Primordial Storm

Tishana has ventured into the eye of the primordial Storm. Learning from this newfound maelstrom of power, chaos, and purity, her path to become The Primordial of Storms has begun.

As an action, you can summon a primordial rainstorm. This storm stems from your own primordial energy, and lasts for 1 minute, and has a radius of 60ft when outdoors, and 30ft while indoors or underground. Any creature caught in the rainfall must make a dexterity save against your spell save DC or become soaked. A creature soaked in your primordial rain is vulnerable to your lightning damage and affected creatures of your choice must succeed on a constitution save against your spell save DC when it takes lightning damage from you or become stunned for 1d4 rounds. A creature can repeat this save at the end of its turn, ending the soaked or stunned condition on a success. Stunned creatures must make the save against stun first, and can repeat the save against soaked on their next turn.

My own storm:

This storm stems from your new nature as a primordial. Your lightning changes in nature, as it travels on a new wavelength of energy. As such, creatures normally resistant or immune to lightning are now vulnerable to your lightning spells while under the Soaked condition. Your lightning fires at different hues of color, at the casters choice

Disclaimer: This is not an additional ability. Only an explanation on the flavor of the applied ability above