Guys I'm sorry but you will lose against Caliborn like seriously you're not trying to kill him or poof him away you're challenging him, it sounds more impossible than impossible itself (still though good luck yadayada all hail lord of time bye)
impossibles have a track record of not meaning much of anything, you ever hear about the principle that as soon as you make those kinds of standards somebody is going to bust it wide it open
last thing im worried about are little green skull gremlins