There should be this thing called Netherskyblock its like skyblock but your island is in the nether There is also such thing as Nether armour and Nether Swords and they're really rare you can make a nether farm and Nether shops Here's the plugin http://www.curse.com/bukkit-plugins/minecraft/hellblock Give an Agree or a like if you agree
Two skyblocks on one server, one being in the nether (Which, by the way, requires an overworld, so that'll take up space)? Just no.
There is a thing called hellblock. I know another server that his it so it is a thing. I think it would be a great addition.