This mod adds a new dimension "The World of the Zombies" where you can find two new ores "Zombanium" and "Zombium" they are stronger than diaomand. If you combine Zombanium and Zombium tool/armour in an anvil you get the Ultimate version of the tool/armour which is even stronger. There is also a new biome added, its called "The Deadlands". This is an abondend biome whic is a wasteland where zombies can spawn at day.