Tier 2 upgrade
Heart of Oak
Heart of Oak in BTD6: Druid attacks remove Regrow, plus bonus pierce from extra lives. Why it is the cheapest Lych counter.
Attacks convert Regrow Bloons into normal Bloons. Gains 1% pierce for every life gained from the starting value after the upgrade. Maxes at 100% and diminishes if lives are lost.
Stats
Main attack
- Damage
- 1
- Pierce
- 1
- Attack speed
- 1.1s
- Range
- 35
How to use Heart of Oak
Heart of Oak makes all of the Druid's attacks remove the regrow property from the bloons they damage, including tornadoes on the bloons they target. It also gives +1% pierce for every life you gain above your lives at the time of purchase, up to +100%.
When to buy it
Heart of Oak is the cheapest dedicated anti-regrow option after Ezili's Heartstopper. Its most important use is against Lych: a Heart of Oak Druid stops Lych from healing, and in least tiers boss events a 0-2-0 Druid can be worth its tiers on its own, especially against Elite Lych.
For regrow rounds in normal games, 2-2-0 can handle groups, but the best degrowing comes from continuing to Druid of the Jungle. The life-based pierce bonus is a small extra that matters mainly with Jungle's Bounty, which gives lives every round.
Is it worth it?
Yes, especially for Lych. It is a cheap step that makes the whole middle path stronger.


















