Twinned spell + burning hands + shape water. We're gonna burn our way through the mountain, because why climb it when you can do something easier? Using the gardening shears to make enough space between where Sans is burning and the rest of the mountain that he can get his shape water all up in there and keep everything he's not burning safe. He may stop to reinforce his weird paper tunnel with his web spell if necessary.
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Twinned spell + burning hands + shape water. We're gonna burn our way through the mountain, because why climb it when you can do something easier? Using the gardening shears to make enough space between where Sans is burning and the rest of the mountain that he can get his shape water all up in there and keep everything he's not burning safe. He may stop to reinforce his weird paper tunnel with his web spell if necessary.