the.com/spellcaster

means A person (in games, folklore, or fantasy fiction) who works magic by speaking or casting spells.

from A straightforward 20th-century compound: 'spell' (a formula of words believed to have magical power, from Old English 'spell' meaning speech or narrative) plus 'caster' (one who casts or throws, from Old Norse 'kasta'). The phrase 'cast a spell' — as if a spell were something hurled outward like a net or a die — predates the single word, and 'spellcaster' crystallized as its own term mainly through fantasy fiction, tabletop role-playing games, and later video games, which needed a tidy noun for the wizard-type character slot.