Tiaral

But beforehand, cut out his tongue just in case, so that even if he does escape, he won't be able to tell anyone about us.

/ And cut off his hands so he can't write a note? And cut off his nose so he can't point at the map?..
I don't care about the archer. But in general, any option other than killing him is, at least a little, risky. Even wiping his memory, perhaps. Keep that in mind. /
/ At the same time, letting him run into the plains to escape from the archers is also a form of killing, hehe. He probably won't get any experience points for that. /