4Result: 4× Dark Prismarine Stairs
Dark Prismarine Stairs is a shaped crafting recipe that uses 6 items: 6 Dark Prismarine. Place the ingredients exactly in the pattern shown above. The pattern can sit anywhere on the grid as long as its shape stays the same. It needs the full 3×3 grid, so you have to use a crafting table.
Read the Dark Prismarine Stairs article in our Minecraft wiki
You need 6 Dark Prismarine — 6 items in total, arranged as shown in the crafting grid. The recipe gives you 4× Dark Prismarine Stairs.
Yes. The recipe needs the full 3×3 grid, which only a crafting table offers.
It is a shaped recipe: the arrangement matters. You can shift the pattern around the grid, but the shape must stay the same.
