Beneficial

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late Middle English: from late Latin beneficialis, from beneficium (see benefice).

wiktionary

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From Late Latin beneficiālis(“beneficial”), from Latin beneficium(“benefit, favor, kindness”).

etymonline

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beneficial (adj.)

mid-15c., "helpful, advantageous, conferring benefit," from Old French bénéficial and directly from Latin beneficialis "pertaining to a favor," from beneficium "a favor, service, kindness," from beneficus "generous, kind, benevolent, obliging," from bene- "good, well" (see bene-) + -ficus "making, doing," from -ficere, combining form of facere "to do, to make" (from PIE root *dhe- "to set, put"). Related: Beneficially.