|Manga Debut||Chapter 270|
|Anime Debut||Episode 198|
Barriera Medusa (lit. Jellyfish Barrier) is a shield of Rain Flames used by Bluebell after she releases her Box of Carnage. This technique has two stages. Bluebell initially creates an incredibly powerful barrier of Flames capable of stopping most attacks; however, it is a diversion to lure the enemy to come closer.
Once the enemy gets close, they are caught in a deadly field of a 100% pure Rain Flames. The Rain Flames' Tranquility characteristic then stops all bodily functions, killing the enemy.