The lich
Killing the few monsters left was pretty easy. Compared to usual where there were so many enemies that it even looked hard to breathe, here, it was pretty easy.
Of course, the fact that it was easy didn't mean that death wasn't waiting for them. On the contrary, since they knew that it was easy, they paid less attention to their surrounding, thus Eden needed to help them when they needed it, or else, they would have died or at least received a severe injury.
Not that it would have been really dangerous.
Eden could also heal them if needed so they wouldn't be slowed down in the end. And since there was also Kanae who could heal people, there wouldn't be any problem in this regard.
And now they had killed all the monsters on the floor, there was just the boss remaining. And they headed there quickly since Eden wanted to speed up things.