Board Thread:General Discussion/@comment-11276487-20130713025241/@comment-25109952-20130719235719

Aedra lost a large amount of their power (and invulneribility) during the creation of Mundus.Akatosh probably managed to manipulate time and regain his power (but not invulneribility) as shown in his ability to defeat Mehrunes Dagon.Also, Ancano was able to tap into the Eye of Magnus, which should not be possible or comprehensible to a mortal, as it was not meant for them.Therefore, Magnus must have lost alot of power which also affected the Eye.