> Spoilers: This article describes major events from The Gate of the Feral Gods and their immediate consequences in The Butcher's Masquerade.
The Fifth Floor, formally titled The Bubbles, is the fifth level of the World Dungeon and the principal setting of The Gate of the Feral Gods. Rather than placing every crawler in one continuous territory, the floor distributes them among 1,172 enclosed worlds known as bubbles. Each bubble contains four linked environmental quadrants—Air, Land, Sea, and Subterranean—and a castle in every quadrant. A crawler may reach a stairwell by conquering a castle, but no stairwell in a bubble becomes usable until all four castles have fallen.
The floor opens with 178,887 surviving crawlers and a fifteen-day collapse timer. Carl, Princess Donut, and Katia enter the Air Quadrant of Bubble 543, where their assigned objective is the airborne Wasteland Fortress. Their local campaign gradually draws them into the other three quadrants, the assembly of the Gate of the Feral Gods, and a crisis that spreads through the space between the bubbles. By the time Carl and Donut descend, the Gate has also been used to evacuate crawlers from otherwise unwinnable bubbles and to attack the Ninth Floor four levels before the surviving crawlers are scheduled to reach it.
Structure and victory conditions
The Fifth Floor contains more than four thousand castles. Although every bubble follows the same four-quadrant framework, its landscapes, resident species, enemies, and castle scenarios differ. Before entry, crawlers are assigned one of the four environments and select from possible opposing castles. Carl and Donut receive the Air Quadrant and the Dirigible Gnomes, committing them to an aerial fortress while they begin on the floor of a desert basin.
Conquering a quadrant requires either occupying its castle's throne room or killing its designated boss. The stairwell is located in that same throne room. Liberation allows crawlers who began in that quadrant to cross its boundary and assist elsewhere, but it does not make the stairs passable. All four quadrants must be liberated first. When that happens, the enclosing shell opens, every stairwell in the bubble activates, and survivors may enter the lacuna, the dark shared realm in which the bubbles sit.
These rules make each group dependent on strangers it may never have met. A team that defeats its own castle early can still die because another quadrant has no survivors capable of finishing its objective. The barriers also make the order of conquest important. In Bubble 543, taking the Water Quadrant changes the conditions in the Subterranean Quadrant, and alterations inside the flooded tomb create a shortcut capable of destroying the Land castle. The four campaigns are therefore not parallel dungeons; they are parts of one mechanical system whose state changes as each castle falls.
Bubble 543
Bubble 543 is arranged around the immense Necropolis of Anser. Its Air Quadrant is a desert bowl on top of the structure, with the bubble's ceiling another four or five kilometers above the basin and the lower landscapes far beneath it. The Sea Quadrant surrounds the necropolis near its base, the Land Quadrant occupies a ring of exposed ground beside the water, and the Subterranean Quadrant lies within the necropolis itself. Water, drains, electrical conduits, and transport routes connect the zones even while magical barriers restrict their crawlers.
The bubble's four targets are the Wasteland Fortress in the air, the Bridge of the Akula beneath the sea, the Sandcastle of the Mad Dune Mage on land, and the guardian of Anser's tomb underground. Each has a faster, destructive solution built into the environment. The Wasteland can be attacked through vulnerable structures on its underside, the Sandcastle can be washed away through the necropolis drain, and the tomb's waterways can be electrified. These shortcuts reduce the need for direct sieges, but they also endanger NPC settlements, destroy potential loot, or kill crawlers caught in the connected terrain.
The Air Quadrant and the Wasteland
Carl, Donut, and Katia emerge near Hump Town, a fortified settlement of Bactrian camels in the desert bowl. The settlement is caught in a stalemate involving the local Dromedarians and the Dirigible Gnomes overhead. The gnomes' mobile dreadnaught, called the Wasteland, possesses bombers, balloons, and long-range observation equipment, leaving the surface communities exposed to bombardment. The apparent political conflict conceals another population: changelings living among the camels, including Juice Box, who can copy the forms of creatures they touch.
The gnomes and changelings are connected through Wynne, a gnomish Flesh Mechanic held as collateral. The changeling leaders want Wynne's magic because it can temporarily give physical form to Queen Quetzalcoatlus, the ghost haunting the necropolis. Touching that form would let the changelings add the powerful creature to their repertoire. Carl discovers that the hostage arrangement is also tied to one of two paired watches, components of a larger artifact sought by several figures within the bubble.
The assault on the Wasteland combines deception with an attack from the ground. Carl's group uses Wynne's body and changeling disguises to draw a gnomish delegation down, while Langley's crawler team prepares rockets against the dreadnaught. The resulting attack destroys most of the flying fortress and scatters wreckage across Hump Town and the lower quadrants. The surviving command structure is reduced to a small floating house belonging to Commandant Kane and his daughter Bonnie. When Carl and Donut finally reach it, they find that Bonnie has already killed her father. Looting Kane supplies the second mysterious watch, and occupying the commandant's quarters liberates the Air Quadrant.
The victory saves Hump Town from immediate bombardment but leaves many gnome NPCs dead and portions of the settlement damaged by falling wreckage. It also shifts the party's objective. The watches are no longer merely signalling devices used in the hostage arrangement; together with a winding box hidden in another quadrant, they form the Gate of the Feral Gods.
Water, land, and the search for the Gate
The Water Quadrant falls before Carl's group arrives there. Chris Andrews, whose body is being controlled by Maggie My, occupies the Bridge of the Akula and receives credit for its liberation. The victory frees the quadrant's surviving crawlers to leave through one-use escape tubes, but it also contributes to the flooding of the necropolis. Chris travels to the Air Quadrant while the remaining water survivors, Vadim and Britney, reach the land route.
On land, Gwendolyn Duet's group faces the Sandcastle of the Mad Dune Mage. The castle is not a conventional building: it is largely a mass of enchanted sand surrounding a buried stairwell. Its ruler, the glass mage Ghazi, has mixed himself into that sand while pursuing the Gate. A drain built into the necropolis wall offers a simple solution—release the accumulated water and erase the castle—but doing so would also wash Ghazi and his possessions away. Carl, Donut, Katia, and their allies instead use lightning conductors to open a glass passage during a sandstorm and enter the castle to recover the artifact's winding box.
Ghazi's story connects the floor's mechanics to Psamathe, later called Samantha. Believing that he was helping a banished figure named Yarilo, Ghazi had used the box to open a passage into the Nothing. He was instead manipulated by Psamathe, whose divided consciousness occupied both a constructed female body and the sand ooze beneath the castle. The encounter ends with Ghazi defeated, the winding box recovered, and the constructed head shattered before Psamathe can restore herself completely. When the necropolis water is subsequently released, the Sandcastle is washed away and the Land objective is cleared.
The Necropolis and the opening of Bubble 543
The Subterranean Quadrant is the deadliest part of Bubble 543. Its crawlers begin inside a trap-filled maze and are hunted by the incorporeal Quetzalcoatlus. After the Water Quadrant falls, the tomb fills with water, killing or immobilizing much of its population and forcing the remaining explorers into safe rooms. Efforts to recover maps, navigate the traps, and distract the ghost steadily reduce the subterranean team until none of its original crawlers survives.
Carl's allies use the flooded architecture against the guardian. They leave enough water within the necropolis to conduct electricity and reconnect the system during the final storm. Low Thi and Morris Sp help complete the plan from inside, while Gwen and the others fight outside. Quetzalcoatlus is destroyed when lightning electrifies the waterways, but the remaining tomb raiders are also killed. The dungeon credits Gwen, Low Thi, and Morris with the liberation and then announces that all four quadrants have fallen. Bubble 543 opens, and its four stairwells become usable.
This victory is not a clean rescue. The air campaign has destroyed the Wasteland, the land route has washed away a castle, and the subterranean solution has killed the last crawlers trapped within the tomb. It does, however, give the survivors access to the lacuna and transforms Bubble 543 into a staging point from which other crawlers can be helped.
Orthrus and the lacuna
Before the final liberation, Carl, Katia, and Tran assemble the Gate while trapped inside Lusca, the enormous octo-shark roaming the Sea Quadrant. They set it to transport them to the pazuzu settlement of Pandinus. The portal pulls them, surrounding water, and debris out of Lusca's mouth, allowing them to escape an otherwise unwinnable encounter. Its closure also releases Orthrus, a two-headed juvenile gate guardian formerly trapped in the Nothing.
Orthrus is physically enormous but only level 10 and is not protected by divine invulnerability. His appearance attracts Emberus, the blind god of fire and ash, who believes his dead son's missing dog is inside Bubble 18. Emberus begins heating and battering that bubble while Orthrus remains in Bubble 543, turning a side effect of the Gate into a threat against crawlers in several worlds. Once Bubble 543 opens, Orthrus escapes into the lacuna and bounds across neighboring bubbles, damaging their terrain without understanding the danger around him.
The dungeon converts the crisis into a floor-wide world quest. Carl and Donut use a captured gnomish aircraft to lure Orthrus toward Emberus while other crawlers, including Quan Ch, try to kill the vulnerable animal for a reward. Donut repeatedly heals the puppy, and Carl finally declares himself a worshipper of Emberus so that the god is summoned to his location. Emberus recognizes Orthrus, and both disappear from the floor. The reunion ends the immediate threat to Bubble 18, though the intervention binds Carl to a deity whose demands continue beyond the Fifth Floor.
Evacuation of other bubbles
With Bubble 543 open and the completed Gate still available, Carl's allies organize an evacuation for bubbles whose surviving crawlers cannot conquer their last castle. The first candidates must have access to the Desperado Club, have survivors gathered in a single quadrant, and have the other three castles defeated. These conditions allow the Gate to be passed between geographically isolated groups through the club while minimizing the chance that crawlers remain elsewhere in a supposedly evacuated world.
For each rescue, a designated carrier opens a portal from the trapped bubble to Hump Town. The survivors cross and immediately proceed to Bubble 543's stairwell. The carrier passes the Gate to the next group through the Desperado Club, while closing the portal leaves a feral god in the now-abandoned bubble. The procedure is dangerous because released gods can break bubbles, wander through the lacuna, or provoke full deities, but it avoids the otherwise mandatory fourth conquest.
An initial operation removes slightly more than five hundred crawlers from eight bubbles. A second round targets fifteen worlds and approximately eight hundred more people, and additional bubbles are added before the effort ends. In total, the group saves about 1,500 crawlers. The dungeon's producers permit the method to continue after legal challenges, even as escaped gods and the environmental remains of ruptured bubbles make travel through the lacuna increasingly hazardous. During the operation, the surviving population falls below 100,000 despite many crawlers already having reached the Sixth Floor.
The attack on Larracos
Carl initially proposes using the Gate to place a feral god on the Ninth Floor, where the faction armies are already assembling. He later changes the plan so the artifact can be preserved. Katia opens the portal from the flooded lower reaches of Bubble 543 into the faction market at Larracos, while timed explosives, blood, sharks, jellyfish, and a sustained torrent of seawater are drawn through it. The portal remains open for roughly twenty minutes, and the inverted city's lower levels flood before it closes.
The attack damages military preparations without requiring the crawlers to be physically present on the Ninth Floor. It destroys market infrastructure, kills an uncounted number of NPCs and mercenaries, and disrupts the factions' ability to buy equipment from crawler and hunter markets. The upper residential levels are expected to avoid the worst of the water, but the attack is not limited to soldiers. Carl recognizes that innocent NPCs will die and proceeds because the city and its inhabitants are otherwise intended to be consumed by Faction Wars.
Juice Box travels through the flooded route separately. Carl instructs her to hide in Larracos, tell other NPC survivors what they are, and prepare them before the crawlers arrive. This transforms an NPC introduced through Hump Town's local hostage conflict into an organizer operating several floors ahead of the main party. The Gate itself remains in crawler possession rather than being sacrificed to summon a god.
Outcome and legacy
The Sixth Floor begins with 85,223 crawlers, fewer than half the number who entered the Fifth. The difference reflects the lethality of the linked-castle rule: defeating one scenario cannot save a bubble whose remaining quadrants fail. Carl's rescue operation preserves approximately 1,500 people, but it cannot reach most trapped worlds, and even apparently intact bubbles become monuments to groups that died before completing all four objectives.
The Fifth Floor also changes the scale of crawler intervention. Carl's group begins by trying to protect one desert town and finishes by moving survivors between sealed worlds, drawing gods into the lacuna, and altering a future battlefield. The flood of Larracos carries the floor's geography forward into Faction Wars, while Juice Box and the changelings turn a scripted local population into an independent political force. The Bubbles therefore end when their stairwells open, but the consequences of their interconnected design remain active far below.