Sewers

Opens from rank E.

Rank	Monsters	Bosses
E	Kyūso, Rat Swarm, Nure-onna, Sewer Kappa	Nezumi-ō, the Rat King, Ōnamazu, the Sewer Catfish
D	Kyūso, Rat Swarm, Nure-onna, Sewer Kappa	Nezumi-ō, the Rat King, Ōnamazu, the Sewer Catfish
C	Kyūso, Rat Swarm, Nure-onna, Sewer Kappa	Nezumi-ō, the Rat King, Ōnamazu, the Sewer Catfish
B	Kyūso, Rat Swarm, Nure-onna, Sewer Kappa	Nezumi-ō, the Rat King, Ōnamazu, the Sewer Catfish
A	Kyūso, Rat Swarm, Nure-onna, Sewer Kappa	Nezumi-ō, the Rat King, Ōnamazu, the Sewer Catfish
S	Kyūso, Rat Swarm, Nure-onna, Sewer Kappa	Nezumi-ō, the Rat King, Ōnamazu, the Sewer Catfish

Half of these gates hold the variant's second boss, Ōnamazu, the Sewer Catfish, instead of the usual one.

Monsters

	Monster	Rank	Material
	Kyūso	Mob	Kyūso Tail
	Rat Swarm	Mob	Rat Whiskers
	Nure-onna	Mob	Nure-onna Scale
	Sewer Kappa	Mob	Kappa Dish
	Nezumi-ō, the Rat King	Boss	Rat King's Crown
	Ōnamazu, the Sewer Catfish	Boss	Ōnamazu's Barbel

Crafted from its materials

Sewer Waders · Serpent Scale Mail · Rat King Amulet · Ōnamazu's Slime Vials

Mining

Every gate grows crystal veins (see Mining).