Noctiluca

The Noctiluca (電磁砲艦型ノクティルカ ,), referred to as Plan Schwertwal (プラン・シュヴェルトヴァール,) by the Legion, 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.

Description
The Noctiluca is a massive Legion unit with a length of over 300 meters, dwarfing even the Stella Maris. It 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 revolving autocannons for antiair purposes.