Retaliation

Retaliation is an attacking style and gameplay element first appearing in Bloons TD 5 and appearing in many other games since. It is characterized by a tower or other active element having a specified gameplay reaction to when Bloons leak.

Heroes' voice clips whenever a leak occurs do not count as Retaliation, since they have no gameplay effects.

The Bloons Wiki represents Retaliation with, the Bloons TD 6 upgrade icon for the Legend of the Night, because it is the most powerful form of Retaliation, being the only one of its kind to prevent a B.A.D. from losing lives when it "leaks."

It is distinct from Vengeance in that Vengeance occurs when a tower reacts to the current amount of lives the player is possessing (which can be changed by leaks), while Retaliation occurs whenever a leak happens regardless of the amount of lives.

Examples of Retaliation
The Angry Squirrel in Bloons TD 5 gains a temporary boost to attack speed and range upon a leak. Bloons Monkey City Mobile also has the Egg Scrambler, which activates what is effectively a Monkey Boost when a leak happens.

Bloons TD 6 introduces a few other towers with Retaliation. Elite Defender gains an immense speed boost when a life is lost, and Bomb Blitz destroys all onscreen bloons weaker than a ZOMG when a leak occurs. The Legend of the Night also spawns its black hole whenever a bloon leaks. Unlike other forms of Retaliation, Legend of the Night also prevents the leaked bloon from taking away Lives.

Bloons Adventure Time TD also grants Finn and Princess Bubblegum the ability to Retaliate. Finn's Bound By Word boosts his speed when a bloon leaks, and Princess Bubblegum's Royal Promise takes away 50 more lives when the player loses a life, among other possible triggers (e.g. Ice Frog Alarm).