Directly West of where you'll find Mokou is another one of Alice's dolls.That way the barriers can be lifted without having to go through the boss fight. She won't appear until you've met Reisen on 3F. Be sure to go back down to floor 3 through the now unblocked staircases for some decent treasure. Mokou can be fought in the upper-right corner of the map and is blocking the path to the blue switch.After its defeat, be sure to head back to floors 2 and 3 to talk to Eirin and recruit Wriggle respectively. In the West side of the map, you'll find the Paralytic Insect.You should be fighting every random encounter anyway. If you've fought every possible boss so far, you should have enough entries after exploring floor 4 for awhile. You'll be able to recruit her once you have 30+ entries in you monster log. You'll want to head directly east of the entrance and trigger another event with Aya. After you had triggered the 2 previous events with Aya.

The rock near it can only be removed if you have fought 300 or more battles. When you're about done with 5F, it'll likely be sensible to take it on. Close to it is a FOE (Lamprey Serpent) that can and should be navigated around at this point. The stairs to 5F are in the upper-left corner.These gates block staircases that lead back down to floor 3. The floor is for the most part straight forward with the exception of two blue gates locked up by a blue switch.

Gemcraft labyrinth unblocked