I found out on this website:
http://castle.wikia.com/wiki/Etrius
In the end of Castle Reprecussians, it shows that the Altar was empty, leaving only blood behind. This could be a possibility that Etrius survived.
I am not lying i Swear!!!!!!!!!!!!!!!!

Lloy didn't die from the rock i read it in Oscar's website in the FAQs and Lloy kept fighting so much that he got tired and the creature turned him into a creature and in Castle Repercussions A Ray sees Lloy as a creature! Please vote for my review!