The Silmarils didn't really provide power, they were just "things of beauty." But after Varda hallowed them, then they could prove to be weapons against the forces of darkness, since the latter could not touch or stand up to the Silmarils for very long.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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