Unless you've brought extra obsidian to the nether, you're kinda in trouble if your nether portal breaks. That's why I think there needs to be a canyon biome in the nether. The canyon would run deep and wide, and would have lava flowing out the walls. The upper areas of the canyon would have quartz, the middle areas would have obsidian and the lower areas would have ancient debris. Now you have a way to fix your nether portal.
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