Annihilation ability: Destroys most Bloons completely and utterly within blast radius.
~ Official BTD6 description
Tech Terror is the fourth Path 2 upgrade for the Super Monkey in Bloons TD 6. It corresponds to the Technological Terror upgrade in BTD5. Along with +25% increased attack speed, +2 pierce, and shooting green plasma balls instead of darts, it gains an ability to deal 2500 damage at up to 2000 bloons within the annihilation range (with a radius of 70), including Camos and Purples. Cooldown for the ability is 45 seconds. Main attack retains the critical hits system gained from Robo Monkey, every 15-20 shots gaining one critical hit inflicting 10 damage.
It costs $16,150 on Easy, $19,000 on Medium, $20,520 on Hard, and $22,800 on Impoppable.
Compared to Sun Avatar, which costs a little less than Tech Terror overall, Tech Terror has lower synergy potential, specifically when interacting with Alchemist buffs and Monkey Commerce discounts, but is compensated by its immense solo grouped popping power. Besides extra pierce and attack speed, the main benefit of Tech Terror is its Annihilation Ability, useful for emergency situations where there are extremely clumped bloons. Its main attack only gains more pierce and attack speed in addition to popping Frozen and Leads in exchange for not popping Purples, only contributing a little bit to the Tech Terror's overall value.
2-4-0 Tech Terror is generally better for the +2 pierce and double attack speed, though 0-4-2 is good for the knockback power of the Knockback upgrade and camo detection from Ultravision.
Knockback can help clump up bloons together, to maximize potential for the Annihilation Ability.
Note that upgrading to Tech Terror prevents the Super Monkey from popping Purples without support, unless further upgraded to The Anti-Bloon. Be sure to provide backup defense against Purples, especially Camo Purples.
The Annihilation Ability is enough to entirely destroy up to Fortified BFBs in a single use. This can be utilized to deal with Round 98, but watch for the ability cooldown.
[version unknown] If the Tech Terror's ability is used on the children of regrow bloons, (etc. zapping a rainbow bloon regrowed from another rainbow bloon's children) it will grant extra cash despite regrowed children bloons normally not giving cash. [unfixed as of 25.1]
Tech Terror had seen competition with Sun Avatar due to Tech Terror's dependence on abilities and not having a much improved main attack. It has been buffed in many updates to increase its usefulness compared to Sun Avatar. In Version 27.0, its power has been greatly increased overall to counter competition of other high-pierce area options such as the Ground Zero ability.
Ability radius increased (40 → 60).
Projectile pierce increased by +2 (due to the Epic Range and Robo Monkey pierce buffs).
Projectile speed increased by 25% from the Epic Range upgrade.
We were finally able to properly implement a popular suggestion for the Robo Monkey, and will be keeping an eye on it's [sic] performance more closely in this update. [...]
~ Ninja Kiwi, referring to Robo Monkey
Tech Terror can now use separate target priorities on both arms.
[...] Additionally middle path has received some basic buffs with Robo-Monkey feeling unbalanced for the high price and difficult crosspathing, and Tech Terror not keeping up with other towers that perform a similar role.
~ Ninja Kiwi
Affected by price drop of Robo Monkey.
Tech Terror ability cooldown reduced (60s → 45s).
While not considered an issue on the same level for Races, the Bloon Annihilation ability has preemptively had pierce reduced under the same reasoning as Ground Zero and Maelstrom, but by amounts that still likely won't be noticeable even under most Race conditions - but we're keeping an eye on it. Additionally the price of this upgrade has been reduced by a fair amount.
~ Ninja Kiwi
Tech Terror now costs less ($22,000 → $19,000).
Tech Terror ability now has less pierce (infinite → 2000).
Robo Monkey has never filled the super effective role it held in BTD5, so Dr Monkey has installed updated HUD targeting systems that now deal occasional critical hits. Additionally as the abilities on this path didn’t match up to their history or other Monkey Tower options (like Ground Zero) so they have been improved significantly in damage and increased radius.
~ Ninja Kiwi
Tech Terror is now able to deal critical damage on its hits
Criticals occur every 20 shots within the 15th-20th shot
Criticals deal a damage increase from 1 -> 10
Tech Terror Bloon Annihilation ability damage increased from 1000 -> 2500
Tech Terror Bloon Annihilation ability radius increased from 60 -> 70
Tech Terror description and artwork in BTD6
All crosspaths (top path 1, bottom path 3)
BTD6 Annihilation Ability (Version 9.0)
In Bloons TD 6, its green plasma ball turns blue when above water. The Annihilation green ring remains green above water.
It is possible to win with 4 Tech Terrors in CHIMPS Mode. Along with placing the Super Monkeys within range of multiple Monkey Commerces to afford the Robo Monkey upgrades sooner, the hero Pat Fusty is used. This was even possible before Robo Monkey gained a substantial price cut in Version 22.0. An example can be found here.