How about make a final floor for mausoleum? Maybe put all the bosses from mauso 1-6 there and a final boss in the outer edge and make it huge as to impose the power difference and utter despair. Could be like a different form of lich, maybe like one that looks more sinister and evil. Can be accessed only by those who are luminous templar or dark apostles as to prevent any un-experienced players getting in the way. Anyway its just a little idea i was thinking of, because i liked the concept of having a final boss every end of a zone like in tindrin where rendtail was the final boss. You guys can decide the token and gold drop as to not break the economy and make the grind worthwhile.