Lethe is in fact a powerful solvent for ideas. Handle carefully and you can blow soap bubbles with it, each a tiny, transient, doomed world.
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Rinse a few books with the same flask of Lethe and you may actually gain memories from drinking it. Tastes vile, procedure not recommended.
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'The Night': 2cl blackthorn syrup, 1cl rum, 1cl Lethe (choose genre or 'surprise'), ice.
You won't remember the night, but everything else.