The Nightmare Mod [mineideas contest]

I would like to submit a Nightmare mod! This mod will add a brand-new place in Minecraft called the Nightmare Realm! Now, what would this mod have exactly? This mod would add all-new mobs such as a Nightmare spirit, a black ghost, a Demon, and (possibly) Herobrine! It will also add new ores such as Dark ore used to make armour and weapons, and Nightmare ore which is only to be used for swords. This mod will keep the regular monsters such as the creeper, skeleton, zombie, etc. BUT, this mod will make them Faster, Stronger, and with better defences. What would the Nightmare realm look like you ask? Well, the sky will be a deep purple, the sun will never rise, the grass is blackened, and there are lava pools everywhere. How do you get to this horrifying realm? Well, there is a 1/5 chance that when you sleep, you will magically be transported there. Then, to leave, you need to build another bed and sleep in that bed. Well, I hope you have enjoyed! :D