This could be a real boon to a kingdom if large enough. Rather then a storage chamber, it could be used as an ice-maker. With enough capacity, you ave now given a kingdom refrigeration and increased their food preservation abilities dramatically, which an in turn change population and power balance.
Simple yet very powerful. Nicely done!
I think elaborating on the madness would have brought more to the table. Right now we have an Alexander/Napoleon type leader and hints he is going mad. Giving more insight to spring off with would be good.
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Edit: See the linked subs to properly position this here leader.