30 Mobs, 4 Bosses, 4 Dimensions!
You get into the dimensions by getting gems from the boss's, you get the orbs to spawn them with these recipes (see forum post)
Eudor is green orb boss, it comes from the Euca dimension, after killing enough Euca mobs a "Euca Tablet" will drop and you can craft that into the Eudor orb.
You will get a random amount of gems from the boss's.
Withering Beast - Euca gems
Calcia - Euca Gems
Nether Beast - Euca Gems
Eudor - Depths Gems
Which make 3 blocks per 9 gems.
I'm going to add another system to how to get gems (Euca boss's will drop Depths Gems ect) after i get the models for the other boss's.
They need to be mined with a Diamond Pickaxe or higher. The storage blocks require Iron or higher. Sapphire ore requires an Iron Pickaxe though.