Diamondback

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Monkeys fighting Diamondback in Frontier Legends, the boss head and one of its segments is seen at the top left of the screen.

Diamondback is a Boss Bloon in Bloons TD 6, introduced in version 52.0. It is the third original boss in BTD6 after Lych and Phayze and is currently exclusive to the Frontier Legends DLC, but it is planned to be added as a regular Boss in a future upgrade in 2026. In Frontier Legends, Diamondback serves as the main antagonist to the story, where it destroyed the Sheriff's home and now threatens the entire Frontier.

This boss is composed of multiple segments and its mechanics revolve around pierce and attacks that cause the Boss to debuff itself. Ninja Kiwi has stated that its mechanics are inspired from Bloons Supermonkey 2. Compared to other bosses, its health bar has 5 skulls and couple of a zigzag lines over it, and it also has secondary bar, similar to the heat bar of Blastapopoulos. The purpose of the both of these additions is currently unknown. During the update preview video, the Boss was only shown briefly on the map Chutes where it performed an attack that caused its segments to explode and disappeared from the screen.

Diamondback's name is likely a reference to diamondback rattlesnakes and is visually inspired by the feathered serpent deities from Mesoamerican religions, with its head closely resembling the stone carved heads located at the Temple of the Feathered Serpent in the archeological site of Teotihuacan in Mexico.