Urodia will be a planet covered with snow,rarely there is a unfrozen water,the floor is all made from stone and some dirt,Urodia will have a deep cave system,that will contain the most powerful monsters,and the most rewarding things.There is no atmosphere in Uroidia,so you will need a oxygen helmet to breath. There gonna be mythical monsters in Urodia,and very powerful weapons,and a new ore called Orenite,with orenite,you can create a item that can enchant some ores.Basicaly,if you enchanct silver,you gonna get mythril. Most of the monster gonna be blind because the darkness of the caves,they can sense you with the sounds that you make,even breathing will make then hearing you! In the deeps or the planet will be a ruin,it gonna be a man protecting it,called Zach, Zach will be a lonely man,it was the responsable of the destruction of the planet,he used to be a cientist,then he designed a medicine,to cure he sick daughter,but the medicine was agressive and mutated she,that killed or infected all the planet,causing it to decay and turn into a snowy wasteland. When you finished talking with him,he will mutated,becoming a big green humanoid monster,it as four arms and a aditional eye,it as very strong muscles,delivering powerful attacks. When you killed it,just venture through the dungeon,or better saying,the ruins of the Zach laboratory,and discover he lost researches,and some cool stuff.
This sounds more like a quest or something... Planets are randomly generated so I don't think there would be any planets pre-made except for quests.
