Grimaldi's Traveling Circus was a popular traveling show in the Over City before Scolopendra's cataclysm transformed its ringmaster and performers. Centuries later, its surviving tents stood in a ruined district of the crawl's third floor. The former entertainers had become predators, yet they continued to guard the encampment and stage performances inside the big top. Redstone Grimaldi, now a Pestiferous Vine rooted in the center ring, kept much of his company alive through a cycle of infection, death, and regeneration. The circus's remaining unaltered performer, Tsarina Signet, attacked it night after night to end that cycle. Carl's involvement in her struggle completed the quest The Show Must Go On and brought the third floor incarnation of the circus to an end.
The traveling company
Before the cataclysm, the circus moved through the Over City in a procession of carts and erected its tents in local parks. Its arrival was an occasion for children, and its acts included trained animals, clowns, jugglers, acrobats, a sideshow, and a three-ring big top. Grimaldi was a dwarf, the owner and ringmaster. The description Carl receives on encountering him emphasizes that Grimaldi regarded the performers as his family. That attachment matters to the circus's later existence: the company did not persist simply because its monsters were difficult to kill. Grimaldi actively preserved them after their transformation, even when their continued lives endangered everyone around them.
Several of the acts retain names and traces of their former roles. Grimaldi's Amazing Juggling Lemurs once entertained children with balls, pins, and knives. Madam Kiki trained a dozen dancing male lions. Heather, a roller-skating bear, had performed since she was a cub and was nearing retirement when the catastrophe occurred. Clammy joined the circus as a young boy and became one of its clowns. The ogre strongman Apollon was another recognizable member of the company. These histories appear in the dungeon's descriptions of the creatures Carl encounters; they establish that the attackers in the ruined streets were once individual performers, not an unrelated population of monsters occupying abandoned tents.
The company also gave Signet refuge. She tells Carl that Grimaldi took her from the Hunting Grounds as a child, sheltered her from the high elves, and gave her a family among the performers. As she grew older, her feelings for him became romantic. Grimaldi gave her the name Tsarina Signet after she told him of her mother's royal ancestry among the naiads. An old sideshow poster still advertises Signet and her battle squad when Carl first surveys the camp, but someone has marked her image as a traitor. The defaced poster shows how completely the former family has divided by the time crawlers arrive.
The cataclysm and Grimaldi's control
Signet's account places the disaster near the end of a performance. Grimaldi stood in the center ring while the company took its bow. Scolopendra's poisonous cloud changed the performers in different ways; Grimaldi became the enormous vine that remained in the ring. Signet says she alone escaped alteration by the cloud. The transformed performers inside the tent were then infected by mold-covered parasites and brought under Grimaldi's control. The company could no longer travel, leaving its carts, tents, and acts fixed in the ruined Over City.
Grimaldi's transformation gave him a means of keeping the family together at a terrible cost. Spores from the vine infect parasitic worms, which in turn infect other creatures. The affected performers obey him. When they are killed, spores can return to the vine and the performer can be regenerated the following day. Signet demonstrates the cycle to Carl after the party kills several mold lions: mold leaves a dead lion and begins moving back toward the circus. She warns that destroying the visible growth is insufficient if even a small amount returns. Grimaldi's own dungeon description says the regenerated family retain their memories, though imperfectly. Their repeated return is therefore more disturbing than the replacement of one set of monsters by another.
The creatures behave according to both their altered bodies and their old circus identities. Former juggling lemurs throw knives and stalk the surrounding buildings. Stilt clowns have become towering attackers armed with butcher knives; rounder clowns serve elsewhere in the encampment. The lions once trained to dance now carry mold and parasitic growth. Heather hunts for the circus, subduing victims who can be dragged back to feed its clowns. Her eventual release shows that an afflicted performer can still have an individual self beneath the infestation. The circus's continued operation conceals that suffering under the outward forms of a show.
A guarded encampment in the Over City
Carl, Princess Donut, and Mongo first encounter the circus through its outlying creatures rather than through Grimaldi. A lemur attacks them from a ruined building, and Carl receives The Show Must Go On, a quest to discover why the old circus persists and stop its violence. The party later finds the bodies of three crawlers killed by former circus lemurs. Their deaths make clear that the roaming sentries threaten people well beyond the big top. Donut spots the tents several streets away, along with giraffes and the sound of circus music, and the group moves closer to inspect the place.
From a building overlooking the site, Carl and Donut see three large tents, smaller tents, wagons, cages, and a sideshow identified as Grimaldi's World O' Freaks. They also see the strongman, clowns, lemurs, and other transformed acts. The circus has constructed a low defensive wall from scavenged material and has placed wire obstacles in the street. Performers drag skins over the fortifications as night approaches. The camp looks less like an unguarded ruin than a position expecting an attack. The pair eventually learn why: Signet assaults it repeatedly, and the company's defenders prepare for her each evening.
The defenses extend into the nearby streets. Lemurs watch from buildings; other creatures withdraw toward the tents at nightfall. Acrobats fire magical mortar rounds from the circus during Carl and Donut's retreat. Mold lions confront the party while Signet prepares a summoning, and Signet later warns that killed defenders will return if Grimaldi's spores reach the vine. The combination of roaming hunters, artillery, and regeneration makes a simple attack on the outer company unlikely to resolve the quest. It also explains why Signet can win ground against the defenders without ending their captivity.
Signet's assaults
Signet's attacks are aimed at the family Grimaldi keeps alive, but her method initially puts Carl and Donut in danger. Her tattoos can become blood-and-ink elementals after she sacrifices a suitable creature. During their first meeting, she draws the party into a confrontation with mold lions and expects Carl's death to supply the blood. He and Donut survive the encounter, leaving her without the sacrifice she needs. Signet then admits that she had intended to use Carl and explains that her target is the vine at the circus. The failed attempt exposes a grim symmetry: Grimaldi uses transformed performers to protect the company, while Signet tries to kill members of that same company to summon an army capable of reaching him.
The following day Signet prevents Carl and Donut from leaving the area. She places Donut under her Water Lily sleep spell and tells Carl that Donut will remain asleep until Signet releases her; moving Donut from the place where she lies causes her health to fall. Carl leaves Mongo to guard her and accompanies Signet. During their walk, Signet recounts the catastrophe and identifies Grimaldi as both the ringmaster she loved and the source of the company's continuing infection. She has captured Heather the bear to provide a stronger sacrifice than the creatures she has previously used. Carl must defeat Heather himself for Signet's summoning to work.
Heather's defeat changes the purpose of the sacrifice. Carl first fights the terrifying transformed bear, but an accidental healing effect kills the infestation within her. Briefly free of its control, Heather is dying anyway; Carl ends her suffering. Signet thanks him for releasing a member of their family who had been trapped in the same cycle for two centuries. Heather's blood gives Signet a powerful but short-lived force of elementals. The army breaks through the outer defenses, disperses the clowns and lemurs, and pushes down the smaller tents. Signet even stops a summoned ogre from smashing the old calliope, a surviving object she still treats with affection. Her attachment to the circus remains visible amid the assault.
Victory outside does not grant access to the big top. Ancient protection prevents Signet and her summons from entering or damaging its exterior, and Grimaldi has banished her from the tent. A water attack from one of her largest elementals fails to break the barrier. Signet directs Carl to use a big top ticket taken from a clown. The ticket promises safe passage through public areas, provided its holder does not become violent, but gives no protection in the three rings. Signet proposes that Carl break the tent's support poles from within so that she can reach Grimaldi. He recognizes the danger of attempting that task alone while a city boss occupies the center ring.
Inside the big top
Carl enters through a clown-faced passage holding the ticket. Clammy the Clown inspects it and lets him pass. Inside, the infected performers continue versions of their old acts: lemurs juggle, clowns sing, and acrobats move overhead. They do not attack the ticket holder while he stays in the public area, despite remaining hostile on his map. The crowded performance makes the big top more than a boss chamber. Grimaldi has maintained the appearance of the circus his family once presented to audiences, even though the acts and performers have been grotesquely changed.
Grimaldi himself occupies the entire center ring. The pale growth reaches the roof and envelops the central pole, while thick roots spread across the tent floor and into the seating. Carl identifies him as a level 85 elite city boss. The boss's description connects his regeneration of the performers to his desire to keep them safe. Carl also encounters Apollon, who offers an apparent frozen treat consisting of writhing worms. That transaction later becomes Carl's route into Grimaldi's shared consciousness. In the meantime, Carl can approach a root from the bleachers because the ticket and the staged performance keep the company from attacking him.
Mordecai has explained a vulnerability of Pestiferous Vines: poisoned blood absorbed through a root can sever the vine's link to its infected creatures after a delay. Healthy blood from the same person can reverse the effect. Carl deliberately poisons himself, cuts his hand, and lets the vine absorb his blood. He then cures himself. Instead of waiting to kill Grimaldi, he asks Zev to convey a bargain to the producers of Signet's serial drama, Vengeance of the Daughter. Carl offers future participation if he and Donut survive, using the threat of curing Grimaldi to gain the producers' agreement. He gives the root his healthy blood, so the poison does not become the final solution to the circus quest.
Carl then accepts Apollon's worm-filled cone. He has learned Wisp Armor, whose temporary protection against mind control gives him a narrow chance to survive the infestation. The worms enter his body and address him as part of Grimaldi's family. Grimaldi's own voice becomes distinct from theirs, allowing Carl to carry a conversation out of the tent. Signet initially sees an infected Carl as another threat, but he explains that he can hear Grimaldi while the spell keeps him in control of his actions. The contact creates the opportunity that neither Signet's nightly attacks nor Carl's original plan to collapse the tent had provided: Grimaldi and Signet can finally speak to one another.
End of the third floor circus
Through Carl, Signet tells Grimaldi that the performers he preserves are suffering and harming the people they once entertained. Carl argues that both of them have been acting out of concern for the family, while their methods keep the conflict going. He appeals to what he has seen of Heather's release. The exchange ends when Grimaldi removes Signet's banishment. Carl takes a prepared cure for his own infestation, and Signet enters the big top. The quest completes without Carl killing the city boss or breaking the tent poles. The scene establishes Grimaldi's decision to admit Signet; it does not show every moment of what happens between them inside.
At dawn, Carl sees a light and feels a rumble from the circus's direction. Donut wakes, as Signet had promised. When the party passes the site, the tents and bodies have vanished. A stairway is now visible nearby, which Mordecai suggests may have been hidden until the quest was complete. Carl receives the quest's rewards, but the disappearance of the encampment leaves no city-boss corpse for him to loot. The absence of the tents is the immediate, observable end of Grimaldi's Traveling Circus as a fixed third floor threat.
Signet later gives a fuller account of that night. She says Grimaldi killed the parasites and freed the clowns, lemurs, and other performers; they crumbled away rather than returning for another performance. She took Grimaldi with her, still transformed rather than restored to his former dwarf body. On the sixth floor, she reports that he was planted beside an all-tree node and that his roots joined it. The circus's tents and acts do not return there as a traveling company. Grimaldi survives the end of the third floor encampment, while the performers he had kept in their painful cycle are finally released.