|Colors||Blue, brown, white, green, red, black|
|Weapons||Toxic breath and fangs|
Doom Vipers were six headed snake-like Rahi created by Makuta Chirox. They had toxic breath that could kill any forms of life, with the exception of others of their kind. They got into Ga-Metru once by way of a merchant ship that arrived from a distant land. Curiously, it was unmanned, but by the time that this was discovered, the Doom Vipers had slithered their way out of the ghost ship onto the island. Due to the toxic breath, only mechanical beings like Vahki had much success against them.
The Visorak had little success capturing them, as their venom weakened the webbing, so the Visorak trapped them in enclosed places and sealed them. Sometimes other Rahi unearthed these tombs to find the Doom Viper alive. The same could not be said for the rescuer.
On their return to Metru Nui, the Toa Nuva defeated several Doom Vipers by using their Kakama Nuva to confuse them and defeat them. Most of the Doom Vipers were then locked in Stasis Tubes in the Archives.
- The Doom Viper model was designed by Allen Proulx.