How the Hypnobrai came to be is unknown, but their ancestors, the Pyro Vipers had a truce between the humans and Serpentine. They were ruled by 5 generations of Mambo's before being shortly ruled by Aspheera. As time passed, their tribe would come to have arguments and conflicts with the other four tribes of the Serpentine and later humans as well. They were involved in the Serpentine War, and we're locked underground for 40 years for their crimes.
Years after, Lloyd had released them, and they served under his command until Skales took control and became their general. They would soon work under Pythor, who became their King, they helped Pythor in acquiring the four Fangblades of the Great Devourer, only to retreat after the beast is released. They would again switch command with Garmadon then Skales becoming their King, until they were trapped again when trying to bury Ninjago City. After their second imprisonment, they would eventually come to peace with the humans and stop their acts of vengeance, refusing to be included in any affairs of the surface world.
The Pyro Vipers would later be risen back to life after the sorceress, Ashpeera escapes her imprisonment.
All Hypnobrai have a cobra-like hood, with the Soldiers, Warriors, and Generals having a full cobra head. Their colors are generally blue, yellow, and medium/dark gray. Selma, however, is pink. Their eyes are red, with concentric circle patterns resembling a large spiral; these patterns rotate whenever the Hypnobrai begin hypnotizing their opponent(s).
Ordinary Hypnobrai don't have long tails and instead have legs as opposed to the General, who gains a long tail from their staff. Baby cobras are relatively small and look like actual snakes
- Hypnobrai hypnosis: The Hypnobrai have the power of hypnotism. They rattle their tails and stare at the victim, and if the victim happens to look their way, they are placed under their control. The Hypnobrai Staff has an anti-venom that will undo the hypnotic spell.
- Protective eyelids: The Hypnobrai have a protective second eyelid over their eyes, for when they are not hypnotizing someone.
- Eye contact: The Hypnobrai's hypnotic stare only works if they can make eye contact with a victim for a certain time. As such, avoiding eye contact will prevent one from becoming hypnotized, but the difficulty of fighting blind can be a hindrance. In "All of Nothing," Kai trained himself to fight with his eyes closed to avoid losing his advantage over the Hypnobrai, while in "Ninjaball Run," Zane simply turned his head around to avoid being hypnotized by Rattla.
- Concentration: Another way to avoid the Hypnobrai's gaze is to attack them or otherwise break their concentration, as Skales did during his battle against Slithraa in the Slither Pit. However, the Hypnobrai can still induce partial hypnosis in their victims if interrupted, as seen when Skales attempted to hypnotize Cole; although the hypnosis was interrupted, Skales was still able to see through Cole's eyes at will and actively command him to attack the other ninja when they attacked Lloyd's treehouse fortress.
- Reflective surfacing: The most beneficial means of circumventing Hypnobrai hypnotism is to use a reflective surface to bounce their gaze back at them—not only does this negate their attempt to hypnotize their victim, but it also leaves them suggestible to commands. Lloyd inadvertently discovered this weakness when Slithraa accidentally reflected his hypnotic gaze onto himself with the surface of an icicle, allowing Lloyd to gain control of the Hypnobrai through their brainwashed general.
The Hypnobrai tribe were sealed away in the snowy mountains until Lloyd Garmadon accidentally released them. This cobralike tribe have hypnotic powers. With one look of their swirling red eyes, Hypnobrai warriors can force their enemies into doing whatever they want.
- The Hypnobrai was the first snake tribe to appear in the TV series. It is also the first and, so far, only tribe to have seen a revolt, or a Slither Pit duel to determine a new general.
- Their name is derived from the word "Hypnosis," due to it being their main trait. It also comes from cobra, which they resemble, such that the name comes from Hypnobra plus the suffix -ai.
- The Hypnobrai have the lowest number of Warriors seen in the series—they never appear to have more than one at any given time, and Slithraa mostly disappears from the series after "The Snake King," leaving the Hypnobrai ranks to be filled by Soldiers and Scouts.
- When they rattle their tail and tilt their head, that warns people that they will be put in a hypnotic trance, thus they will be able to avoid their glare.
- The Staff of Elements appears to have a Hypnobrai tail.
- In the Korean shows, Hypnobrai is pronounced as "HYPE-no-brye".
- The Character Trailer for the Hypnobrai misspells them as the "Hybnobrai."
- It appears that the higher the rank within the Hypnobrai tribe, the more blue coloring a Serpentine has.
- Though their minifigures use the navy blue LEGO color, the Hypnobrai in the TV series often appears as a lighter shade, being more of a cross between that color and the recently-revived teal.
- A Hypnobrai general is seen in the flashback to the Serpentine War in "Spellbound," but it's unknown whether this was Slithraa or a previous general who was replaced during entombment.
- A bronze statue of a Hypnobrai general is seen in the Ninjago Museum of History in "Winds of Change" and "Day of the Departed." It's unknown if this was created to resemble Skales, Slithraa, or an earlier general.
The images on Hypnobrai need to be organized.