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Generally, in the verse, they always use "magical/life something energy/power" to produce the slightest phenomenon."This stone is warm."
One of the wintering tools. A baseball-sized stone called a hot stone was designed to generate heat by using coldness as energy.
If you add a bucket of snow or ice like firewood, it will generate a heat of about 50 degrees Celsius for about two hours.
But this immediately produces an effect without magical power