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Gains 10% attack speed and 1% for every life lost from the starting value after the upgrade. Maxes at 50% and diminishes if lives are restored.
~ In-game description

Heart of Vengeance is the second upgrade of Path 3 for the Druid in Bloons TD 6. It gives the Druid automatic 10% attack speed, and adds a 1% attack speed buff for each 1 life lost from when the upgrade is bought. The attack speed buff is capped at 50%, meaning that the maximum attack speed buff is attained when 40 net lives are lost. This buff will reverse if lives are gained. The upgrade ignores any lives above the starting lives in the current game.

Secondary attacks such as Lightning from Heart of Thunder are also affected by this, making the casting of them faster.

This upgrade costs $255 on Easy, $300 on Medium, $325 on Hard, and $360 on Impoppable.



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Heart of Vengeance

The Druid's green gem now turns into a red gem with a headband and the Druid also receives a black cloak.

It increases attack speed by +10%, and increases attack speed by +1% per net life lost, up to 50%, and ignores lives lost above the starting lives.

Targeting Priorities[]

Heart of Vengeance targets bloons using the standard targeting priorities. Its main thorn attack shoots straight movement projectiles.

  • First: Targets the first bloon visible within its range.
  • Last: Targets the last bloon visible within its range.
  • Close: Targets the closest bloon visible within its range.
  • Strong: Targets the strongest bloon visible within its range.


Updated as of Version 43.0. Listed prices exclude external buffs, any sacrifices, and Monkey Knowledge.
[Module | Data] Purchase Sell
Costs Easy Medium Hard Impoppable Easy Medium Hard Impoppable
Upgrade (X-X-2) $255 $300 $325 $360 -
Total (0-0-2) $680 $800 $865 $960 $476 $560 $606 $672
Crosspath (1-0-2) $975 $1,150 $1,245 $1,380 $683 $805 $872 $966
Crosspath (2-0-2) $1,695 $2,000 $2,165 $2,400 $1,187 $1,400 $1,516 $1,680
Crosspath (0-1-2) $890 $1,050 $1,135 $1,260 $623 $735 $795 $882
Crosspath (0-2-2) $1,185 $1,400 $1,515 $1,680 $830 $980 $1,061 $1,176

This upgrade's prices (or included crosspath's prices) are affected by the following MK: WarmOakIcon Warm Oak, BetterSellDealsIcon Better Sell Deals



Heart of Vengeance allows the Druid to become more effective in combination with life loss. For the best results, try juggling between losing as many lives as possible in the early-game and avoiding losing the game. In addition, avoid any life-regeneration upgrades in the defense, as this will harm Heart of Vengeance's special life-loss benefits.

An interesting strategy on game modes other than Impoppable or CHIMPS is to spam as many 0-0-2 Druids as possible and lose as many lives as possible without losing the game, allowing as many Druids as possible to benefit from this upgrade. Similarly, slowly using Ezili's Sacrificial Totem every so often to drain away lives manually can be done to create a similar effect. On Impoppable and CHIMPS, this is simply a +10% attack speed boost, which while small is significant for already powerful Druid upgrades.


  • Just as losing lives will increase attack speed, gaining lives will make Druids with this upgrade attack slower. It is best not to use life gaining strategies with this path of upgrades, such as with Benjamin, Support Chinook's Supply Crate ability, the Spirit of the Forest ability, or Marketplaces with Healthy Bananas.
    • However, in practice, this effect is not as pronounced as the following upgrades can still be functional without the attack speed buff.
  • Lives absorbed by the Mana Shield do not count towards the attack boost.
  • Note that using a Continue will decrease Heart of Vengeance bonuses, as using a Continue refills all lives, thus lowering Heart of Vengeance bonus.
  • On CHIMPS, since lives can neither be regenerated nor lost, treat this upgrade as just a +10% attack boost. It is a small boost, but it can make a difference for powerful Druid upgrades, such as Druid of the Storm's tornadoes.

Version History[]

Balance Changes[]

A slight buff to this upgrade to make it not useless on game modes where losing lives is not an option. In Version 43.0, the maximum attack speed was nerfed to only 50%, as Heart of Vengeance Druids were extremely popular for Least Cash Boss Bloon Events and other game modes.

  • BUFF Heart of Vengeance now gains a +10% starting attack speed buff upon upgrading. This is part of the potential 100% attack speed buff.
[...] Heart of Vengeance itself has been allowed to remain overpowered for a long time since life loss is not always an option in different challenges/modes, but with newer competitive modes being added over time that do allow for this mechanic to be, overindulged, shall we say, it feels due for substantial rebalance.
~ Ninja Kiwi
  • NERF Heart of Vengeance lost lives maximum rate bonus reduced 100% to 50%

Bug Fixes and General Changes[]

  • Change Description changed from "Gains attack speed up to 100 lives lost after getting this upgrade, Lives above maximum do not count." to "Gains 10% attack speed and 1% for every life lost from the starting value after the upgrade. Maxes at 100% and diminishes if lives are restored."

Extra Notes (Version History)[]

  • Version 43.0 did not correct the upgrade description to "50%".


Official artwork[]


  • Heart of Vengeance used to be useless on CHIMPS Mode, but has since changed after Version 9.0 by providing +10% bonus attack speed by default.
  • Similarly to Druidic Reach, the Heart of Vengeance's gem resembles the Plumbob from the Sims series. The Druid's gem is red, depicting anger.
  • Heart of Vengeance Druid spam was a popular strategy for Least Cash Boss Bloon Events, especially when paired with Ezili, and while still possible, Version 43.0 severely nerfed how strong this strategy is.