This story has a similar idea. A serf gets opportunity to kill his feudal lord during a hunt. He kills him & appropriates two powerful gadgets the lord had: one gives the wearer telepathic power; second makes the wearer invulnerable to any kind of attack. Things happen, & in time, by cleverly using these devices, he rises to be a feudal lord himself. A very cruel one.
Only the gadgets belong to a space faring society & were lost on this world during an accident on one of their visits. Now they're back to recover the gadgets. So they'll end the rein of the cruel lord as they recover their gadgets.
Fact sheet.First published: Astounding, May 1955.
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Among the stories from Astounding/Analog issues edited by John Campbell.
Related: Stories of Everett B Cole.