In one of my mods, I have made stairs for obsidian variants, which I intend to have a blast resistance of 1200. When I tested a creeper explosion on them, they still were destroyed even though I put a blast resistance equivalent to that of obsidian. All blocks with the stair block base have a blast resistance of 6, the same as cobbles or bricks, regardless of whether I put in 20, 30, 40, 1200 or what ever I put in the box.
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