Gigantic spiked ball splits twice into 6 Juggernaut balls for even more destructive power.
~ BTD6 description
Ultra-Juggernaut is the fifth upgrade of Path 1 for the Dart Monkey in Bloons TD 6. It replaces the Dart Monkey's normal Juggernaut with a massive black catapult holding a large orange-red and gray spiked ball. It is unlocked with 22,000 XP. The damage dealt to regular bloons is doubled with this upgrade to 4 (+8 for Ceramics), and its pierce is now 200. The 6 smaller spiked balls that emerge deal 2 damage to bloons and 4 damage to Ceramics with 50 pierce each.
The Ultra-Juggernaut works similarly to the normal Juggernaut. However, unlike the normal Juggernaut, the Ultra-Juggernaut's projectiles split into 6 normal Juggernaut balls twice, and its projectiles can rehit the same target multiple times. Because of how much damage the Ultra-Juggernaut ball does versus Ceramics, it can break apart a standard health Ceramic into 4 Black Bloons and 4 White Bloons.
Ultra-Juggernaut has an unusual niche that allows it to become insanely strong on maps with lots of Line of Sight obstacles. Due to its unique mechanics of rehitting bloons more than once upon bouncing off obstacles, the combined extra damage to Ceramics and overall high damage to other bloons allows an Ultra-Juggernaut to deal serious damage against many grouped bloons within the same location. This is where the presence of many obstacles on the map becomes extremely helpful. Pair an Ultra-Juggernaut with supports from Primary Training, Overclock, and Stronger Stimulant for the best results.
The Ultra-Juggernaut will do 3 damage per shot instead of 1 damage per shot against MOAB-Class Bloons. The Juggernaut balls, along with the Ultra-Juggernaut ball, can potentially do up to 21 damage if they split directly on top of MOAB-Class Bloons.
The Ultra-Juggernaut will tend to struggle against the Super Ceramics after round 80. At this point, it is recommended to use other upgrades like The Bloon Solver or Crossbow Master to deal better with Ceramics.
Ultra-Juggernaut is extremely powerful for its relatively low cost on maps where there are many obstacles, such as Moon Landing or Cornfield, especially when combined with buffs such as a 3-2-0 Primary Training, an Overclock, and a 4-x-x Stronger Stimulant. In fact, unlike most towers, it struggles on maps where there are few or no obstacles.
Ultra-Juggernaut became a much stronger option at countering Ceramics and dealing general damage. In addition, it now become a supreme option for maps with large quantities of Line of Sight obstacles.
Base damage increased from 3 → 4
Ceramic damage increased from 9 → 12
Ultra-Juggernaut projectiles now bounce off walls. Projectiles can't hit the same target multiple times.
Projectiles can now hit the same target multiple times.
Secondary Juggernaut balls are affected by the Juggernaut reworks.
Despite buffs to regular Juggernaut in Version 23.0, no buffs for Ultra-Juggernaut's main ball are inherited. Changes for the secondary Juggernaut balls are affected by this change, with more damage but less pierce, similar to the normal Juggernaut balls.
Since the ball is now centered on the catapult, Ultra-Juggernaut actually changes the position that the projectile is shot from, relative to the tower, by a slight amount. This can improve the accuracy of the tower if it was placed in a position that causes a regular Juggernaut to accidentally fire straight into an obstacle.
This is the only Tier 5 upgrade that doesn't change its Monkey in comparison to the regular one.
It is one of the two Tier 5 upgrades where the monkey wears no clothes at all, including no headgear, the other being Super Brittle.