Arcane Arts and Corvids, part 2 is a manual in The Blood of Dawnwalker.
“A skilled practitioner of magic can use the corvids’s predilection for the ineffable to his or her advantage. Since these birds tend to congregate in places thrumming with arcane energy, one attuned to its flow can reach for these devilish creatures – and then summon them.”
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Source
Transcribed from DawnwalkerDB.