Seiðr in Prose Edda

Kormak said this:

The land-getter, who binds the mast-top straight, honours
the provider of the deities’ fiord [the mead of poetry, whose
provider is the poet] with a head-band. Ygg [Odin] won
Rind by spells.


- Prose Edda, Skaldskaparmal


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Note: In the original Old Norse, this poem that's being quoted (Sigurðardrápa) makes reference to seiðr. The translator just used a more general term. Here's an excerpt from the original Old Norse version of the poem, from the upload on skaldic.org, along with the site's own translation.

Eykr með ennidúki
jarðhljótr día fjarðar
breyti, hún sás beinan
bindr; seið Yggr til Rindar.

‘The land-recipient [RULER], who secures the straight mast, honours the arranger of the fjord of the gods [POETRY > POET] with a headband; Yggr <= Óðinn> obtained Rindr <giantess> through sorcery.’