Homebrew (updated older edition)
2-level Evocation
You brandish the weapon used in the spell's casting and commit yourself fully to a devastating final strike. Make a melee attack roll against a creature within range. The attack is a critical hit on a roll of 19 or 20. On a hit, the target takes an additional 3d10 thunder damage on top of the weapon’s normal damage as a chorus of magical applause sounds within 5 ft. of you.
If this brings the target to 0 hit points, you gain a number of temporary hit points equal to the additional weapon damage. If your attack misses, or does not bring the target to 0 hit points, attacks against you have advantage until the start of your next turn.
When you cast this spell using a spell slot of 3rd-level or higher, the damage increases by 1d10 for each slot level above 2nd.
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