Echo Storm Rite

A creature of your choosing within 10 feet of
you must make a DEX Saving throw or 6d8
Lightning Damage. They take 1/2 as much on a success.
When you deal lightning/thunder damage on
a weapon attack, the target makes a DEX Save
or takes 6d8 Thunder Damage & become prone,
the target takes 1/2 as much on a success.
If you deal Thunder on the Save, after the save is resolved those who failed are pushed 1d4 x 10 feet away.