It seems that rune cannons were developed by many nations in the years prior to the Island Nations War, including the Scarlet Moon Empire. It is rumored that the fundamental control mechanisms and effects of rune cannons varied between the nations, which is what ultimately led Walter's to lead an expedition to the Island Nations to study them.
The Rune Cannons of the Island Nations seem to have adverse effects on the human body. Some have taken it upon themselves in the century following the Island Nations War to seek out and destroy the remnants of this technology.
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