Quote Originally Posted by Malzian View Post
Progress is ONLY saved every 10 floors. If you clear floor 5 and leave, you start on floor 1. If you clear floor 10, you start on floor 11. If you clear floor 15, you start on floor 11.
And this is probably not automatic. So if you missed touching that little pillar before leaving the instance, you still start at your last save spot, even if you completed the floor with the boss. SE always loves to entertain us that way. We will see, but mark my words there will be some stupid pillar, lamp, cross or whatever on the floor/wall/corner of that instance that you need to touch lol.