The Noctiluca (ノクティルカ, Nokutiruka?) is the Electromagnetic Gunboat Type Legion unit. It is capable of surface and subsurface marine travel, and is assumed to have amphibious capabilities. It was first discovered below the Mirage Spire in the waters of the Fleet Countries.
The Noctiluca is the largest Legion unit at a length of 300 meters. The Noctiluca shares similarities to the Morpho in terms of armaments, being outfitted with two large 800 mm Railguns for long-range bombardment, smaller 155 mm rapid-fire railguns for close-range engagements, and 40 mm revolver cannons for antiair purposes.