Believed dead, this was merely a cover as he left Heaven, taking a number of the weapons with him.
Since faking his own death, he has been on Earth enjoying a rather hedonistic lifestyle.
Castiel pulls out of the plan to kill Atropos once she threatens the Winchesters, stopping Balthazar from killing her.
Merely perceiving their true form - even psychically - typically results in blindness, as the appearance of their natural "visage" is overwhelming; it is capable of burning an individual's eyes from their sockets, although certain "special people" are able to withstand their true appearances and voices.
Because their true appearances cannot be safely perceived by humans and because they are spirits with no physical being, they often take on humans as vessels in order to exist in and interact with the physical world, though only with the hosts' consent.
As Kripke put it, "We had the empire, but we didn't really have the rebellion." They had always wanted to have a storyline with a few central characters but having massive battles in the background, comparable to Star Wars and Lord of the Rings, and the addition of angels allowed for this.
Balthazar, portrayed by Sebastian Roché, is an angel who had fought alongside Castiel during the last angelic war.
Supernatural is an American television drama series created by writer and producer Eric Kripke, and was initially broadcast by The WB.
After its first season, The WB and UPN merged to form The CW, which is the current broadcaster for the show in the United States.
Angels require a particular vessel to reach their full potential, people being "chosen" to be their hosts or "true vessels".
Most angels are portrayed as emotionless authoritarian beings.
During a conflict with Raphael and his henchmen, Balthazar destroys the archangel's vessel with Lot's Salt.
Dean then traps Balthazar in a ring of Holy Fire and forces him to give up the boy's soul.
In "The Third Man", the Winchesters discover that three corrupt cops were murdered by the young brother of one of their victims in possession of The Staff of Moses.