This mod allows you to (out of all things) have ACs in Minecraft.
Yes, I know its a random Mod!
You get 2 ACs currently, a Rundown Old AC, and a Slick New AC.
the Old one requires this crafting recipe: 8 Iron Ingots around 1 Metal Bar. And the Newer one requires 8 Iron Blocks around a metal bar.
In a future update, I'm adding AC Monsters.