Question

how was artharvaveda helpful to a king?​

Answer 1

The Atharvaveda Samhita contains hymns many of which were charms, magic spells and incantations meant to be pronounced by the person who seeks some benefit, or more often by a sorcerer who would say it on his or her behalf.

Answer 2

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Jump to Speculations on the nature of man, life, good and evil — Many books of the Atharvaveda Samhita are dedicated to rituals without magic and to theosophy. ... The Atharvaveda Samhita contains hymns many of which were charms, magic spells and incantations meant to be pronounced by the person who seeks some benefit, or more often by a sorcerer who would say it on his or her behalf.