A portal to the Nether requires ten Obsidian blocks (eco version) or fourteen Obsidian blocks for the full version.
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No, you can make it on vanilla minecraft using Obsidian blocks and a source of fire, such as Flint and Steel.
make a wall around lava and tip water in it and repeat it to make a nether portal shape
You will need 14obsidian if you are going to place obsidian on the corners of the portal, but if you fill in the corner of the portal with other blocks, then you will only need 10.
You cant go to Olympus but you can go to the nether.
You put 5x4 blocks of Obsidian and light it with flint and steel. it should turn purple. if not, destroy it, rebuild it, and then light it again. if that does not work restart your minecraft game.