http://www.uesp.net/wiki/Lore:The_Annotated_Anuad
Is there more known of the previous twelve worlds and is Nirn seen as the thirteenth world. Were the worlds of the Ehlnofey and Hist the only two worlds Anu managed to save before Padomay struck him and Anu pulled them both out of Time forever. Would these worlds have been aware that others existed.