A spell (perhaps meta-spell) that allows the caster to imbue their hands with moonlight for the purposes of brawling.

Would do damage similar to slivers:

Katamba - Piercing and impact damage.
Xibar - Piercing and cold damage.
Yavash - Piercing and fire damage.

Or perhaps add this feature to Shape Moonblade.

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"Technically correct" is the worst kind of correct.