Hysteric Empress is one of the final bosses from Darius Gaiden, being fought in Zone X. One of Belser's leader flagships stationed at Planet Darius, Hysteric Empress is in control of a large flying fortress hovering the clouds of Darius. It is shaped after a crab.
Hysteric Empress's attacks involve shooting liquid goo shots which duplicates when shot, laying eggs which release small crab drones and shooting hard to avoid yellow homing lasers. It can also jump out of the screen and land right over the player. After being destroyed, the flying fortress is also destroyed, sinking into the sea of clouds. However, Hysteric Empress mysteriously emerges from the clouds, apparently having survived the explosion.