Blood Moon

Blood Moon is a secret world that can be obtained by using a Moon Charm, an item which, when used, modifies the droids and sets the time to night.

Event
During a Blood Moon, the time will turn night and all droids will gain the Quick, Violent and Elite modifiers. The player cannot warp, doing so will result in the text “I’m not finished with this yet.”

If you beat the Blood Moon, the Moonstone Sword in the Mechtropolis special room will be replaced by the Sword of a Bloodied Moon, which has 150 slash and 300 lunge damage.

Trivia

 * It is the 3rd secret world to be set on nighttime, 4th if you count Null as a secret world.