Doreineji Core (ドレイネージ・コア) is the final boss from the original Raiden.
Description[]
Doreineji Core is a green module with a Red Crystal contained inside. It fights in a traditional manner to many bosses by firing a few random bullets across parts of the stage, with some areas where the player won't be hit, which makes the Doreineji Core an easier boss to fight.
Encounter[]
The final boss shoots in 8 directions from the start and the machinery will add to the tank some side skirt armor. After reaching the main core it will bolster its armament with more gun emplacements.