I'm not usually much one for spells and such, but a dear friend of mine is in a very dark place right now. If we lived in the same city, I'd mow his lawn or cook his dinner. But we don't; so I'm making him magic instead.
My friend is heathen, and Frey is his heart-god. Heathen is for me a second language, but the (admittedly controversial) identification of Vana-Frey with the Horned God of Witches gives me a port of entry. And indeed, at least one 17th-century Swedish witch confessed that she and her coven called the Devil “Frö” (= Frey) (Runeberg 81). The trial is late enough that we cannot rule out the possibility of literary “contamination,” but even if this is the case, precedent is precedent. Interpretatio wiccana, anyone?
The spell is based on the famous passage from Hávamál about Óðinn's nine nights on the tree. While as a poem this may mark the piece as derivative, as a spell it sets up powerful resonances, like a jazz improvisation on a known tune.