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spellbook.tex contains the list of known spells and spells.sty is the actual LaTeX package containing the spell format. This package is tested with LuaLaTeX and pdfLaTeX from TeX Live 2020.
However, to those fortunate few with this spell in their spellbook, the possibilities are endless as to what you can use it for. What Is The Detect Magic Spell? As the Player’s Handbook ...