A notable feature of the floor is its many flights of stairs connecting B21 through B24. The player has to make a roundabout trip through these stairs to reach the other half of B21 and activate the elevator switch. Doing so enables elevator travel to reach the central areas of B23 and B24, culminating in the player finally gaining access to B25.
In Story Mode, after the defeat of Etreant, the party returns to the center of B25 to find a Geomagnetic Pole that leads straight to B30 in order to defeat the Yggdrasil Core and finish the plot. Returning to the Geomagnetic Pole afterwards will cause it to disappear and allow the player to enter B26 and begin exploring the next stratum.
|B21F||Pylon Crab, Chopper Hare, Hexfrog, Burst Ooze, Divine Bee, King Dragonfly||Bone Lizard, Ren & Tlachtga||Drywall, Crystal Wall, Shiny Seed||--||--||2|
|B22F||Chopper Hare, Hexfrog, Silkbinder, Beetle Lord, Gullinbursti, Burst Ooze, Dire Wolf, Divine Bee||Ice Claws||--||Severed Plant, Death Stem, Shiny Vine, Gummy Wire||--||2|
|B23F||Pylon Crab, Chopper Hare, Silkbinder, Beetle Lord, Muskoid, Gullinbursti, Plated Roller, Burst Ooze, Direwolf||Desouler||--||--||Strawberry, Mugwort,||3|
|B24F||Pylon Crab, Silkbinder, Beetle Lord, Muskoid, Gullinbursti, Plated Roller||Arboreal Hulk||Drywall, Crystal Wall, Shiny Seed||--||Strawberry, Mugwort,||1|
|B25F||Silkbinder, Muskoid, Plated Roller, Burst Ooze, Direwolf, Divine Bee, King Dragonfly, Babirusa||Bone Lizard, Ice Claws, Desouler, Arboreal Hulk, Etreant, Storm Emperor*||--||Severed Plant, Death Stem, Shiny Vine, Gummy Wire||--||4|
*The Storm Emperor appears once the quest "Awakening the Serpent" is accessed. Defeating it raises the level cap by 10.