Talk:Kara no Kyoukai Collaboration Event/Mission List/@comment-3567545-20160307212718/@comment-556400-20160307225629

You would need to get to room 504. The boss of room 404 has 100k HP, comparatively the boss of the first story chapter, Fuyuki, has 22k. I would say your chances are fairly low :( maybe if you burned every Quartz on AP regen?

It's really hard to say since the method to keep Shiki is pretty convoluted compared to past events. However, most of the quests you need to run to complete missions in the lower floors cost 20 AP but award very little master XP, so you can't easily exploit leveling quickly as a new account.