Waffle there are still some things that you can do in the Nether. There are 2 ores that should be in the Nether X mod,if you are using the same one I am talking about. One ore is venomite that can be crafted into tools and armor similar to iron, but a sword will poison anything that you hit it with. The other ore is necromite and it is similar to diamonds, but a sword will inflict the wither effect.
I hope this helps.