Ultimate Hard Core

New item:Pumpkin on a stick
New biomes:
Soft Highlands: A place filled with dirt, and cobblestone. Top:dirt Rest:cobblestone/coal ore/dirt.
Ore Biome: 2*2 chunks filled with ore and a bit of cobblestone and air.
Obsidian Biome: 1 chunk filled with obsidian. It is found in a mineshaft, too. Didn't notice that.
Obsidian instead of stone at first hundred or so blocks.
It's actually in hardcore mode now :)
Added future support for not losing progress with updates.
Full explanation:
Note:This is NOT with this update. It will be with uhc 1.11+. 
So, I am going to make it so how you update is doing it with the newly placed structure blocks which say Craft something on them.
So you will get the full world, do not use that world. Unless, of course, you want your progress lost.
Go into where you have it. Click "structures". There will be probably be a lot of random things. You can copy them if you want, but who cares. What you actually need is the crafta, craftb, etc, so select them all and right click it and copy. Close minecraft if it's open. go to your old uhc world, then go to the structures folder inside of that. Paste it. If it asks you if you should replace, replace it. Video coming soon. Look in the description for it. Anyway, also copy the new resources ZIP folder, not normal folder, ZIP folder. Then place it in the old uhc folder too. If it makes a copy, delete the old resource zip folder, and then rename the new one in the old uhc folder to "resources". Keep the .zip at the end. If it doesn't work, ask me and I will show you. Thanks!