This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. One who casts spells; a magician; a sorcerer.

"In the beginning of the book, a spellcaster is killed, leading authorities to Nicodemus's master, all the while the real killer is out seeking the learner for his own purposes, born out of a much larger storyline that is unraveled over the course of the novel."

spellcasting