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Shoots 8 thorns per shot instead of 5.
~ In-game description

Thorn Swarm is the first upgrade on the second path for the Druid in Bloons TD 6. The Druid now throws eight thorns instead of only five. The thorns are still thrown at random angles, but the thorns are overall packed denser as the random angular spread remains unchanged.

This upgrade costs $210 on Easy, $250 on Medium, $270 on Hard, and $300 on Impoppable.



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Thorn Swarm

With the Thorn Swarm upgrade, the Druid receives wristbands with spikes. The wristbands and their spikes are presumably made of wood. Buying Thorn Swarm will cause Poplust's cape to reduce in wideness in addition to adding the spiked wristbands.

Thorn Swarm grants 3 extra thorns to the Druid, granting it a total of 8 thorns from 5.

Targeting Priorities[]

Thorn Swarm 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-1-X) $210 $250 $270 $300 -
Total (0-1-0) $550 $650 $700 $780 $385 $455 $490 $546
Crosspath (1-1-0) $845 $1,000 $1,080 $1,200 $592 $700 $756 $840
Crosspath (2-1-0) $1,565 $1,850 $2,000 $2,220 $1,096 $1,295 $1,400 $1,554
Crosspath (0-1-1) $635 $750 $810 $900 $445 $525 $567 $630
Crosspath (0-1-2) $890 $1,050 $1,135 $1,260 $623 $735 $795 $882

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



Thorn Swarm increases the number of projectiles for the Druid from five thorns to eight thorns. By increasing the number of thorns, this increases the density of its shotgun-like attack. It can come in handy when paired with Hard Thorns for countering stronger early-game bloons, or can be added for increased damage versus early MOABs when paired with Upper Path 3.


  • Thorn Swarm is useful for hitting singular targets, but it is not very reliable against grouped bloons compared to Hard Thorns, which can pop up to two bloons per thorn.
    • This should be considered when crosspathing the Druid. Usually, in late game, MOAB-class bloons are the main bloon sent out, so it is recommended to buy Thorn Swarm as point damage.
  • Earlier game, Thorn Swarm with Hard Thorns is a pretty good option as an early game tower.
  • Transitioning from a Thorn Swarm into the bottom path upgrades is also a good strategy, as it is a good crosspath with bottom path druids.
  • Thorn Swarm synergizes well with damage-increasing support such as Berserker Brew or Jar of Pickles due to its 1 damage, which results in a major increase in popping power.

Version History[]

Balance Changes[]

Thorn Swarm was not changed since initial release.

Bug Fixes and General Changes[]

Extra Notes (Version History)[]


Official artwork[]


  • Thorn Swarm's upgrade icon only shows 6 thorns instead of 8.