In the fictional Amber multiverse a spikard is a type of magical object with hyperdimensional "lines of power" which connect it to sorcerous power caches in various universes. In the Amber novels and short stories two shapes of spikards are explicitly cited: rings and swords. Benedict's metal arm is never explicitly listed as a spikard, but it does share with Corwin's spikard sword Grayswandir the rare magical ability to bypass an existential barrier of intangibility.
