I've been re-reading the "Safehold" saga, and a thought crossed my mind.
Wouldn't it have been lovely if Owl could have recorded holograms of the two Wylsynn brothers before their unfortunate demise, and sent them back to haunt Clyntahn's sleeping hours? For certain sure, it would have terrified his bedmates, and only RFC could imagine what it would have done to the man himself.
Totally impossible for a whole raft of reasons, I know, but I did enjoy the speculation Driving his own mind to administer long-term punishment would have been so sweet.
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