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Any help with phrasing?
Your eldritch blast explodes, dealing either fire or bludgeoning damage, whichever would be more damaging to each target. Additionally, any creature struck must make a fortitude save or be knocked prone, and knocked 5 ft backwards away form the origin of the damage (away from the warlock for touch attacks and cones, away from the center for bursts, and down the line for lines).
At CL 15, this essence upgrades. It now deals the better of fire, bludgeoning, sonic, or force damage; and knocks back 5 feet per 5 damage dealtto the target.
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