Heart of Thunder (BTD6)

For the upgrade in Bloons TD Battles 2, see Heart of Thunder (Battles 2).

Heart of Thunder

Unleashes regular blasts of forked lightning that arc from Bloon to Bloon.

Tower	Druid — Path 1 — Tier 2
XP cost	750
Cash cost	$725 — Easy $850 — Medium $920 — Hard $1,020 — Impoppable

← Hard Thorns

Druid of the Storm →

Heart of Thunder is the Druid's path 1 tier 2 upgrade in Bloons TD 6. This upgrade grants Druid an additional attack which shoots lightning at Bloons. When lightning hits a target, it quickly jumps to nearby Bloons including through obstacles. Lightning deals 2 damage, has 5 pierce, and has an attack cooldown of 2.3 seconds. When lightning hits its target, it splits into up to 2 forks within 86 units, which means each lightning attack can hit up to 31 targets (2 forks ^ 5 pierce - initial attack). Lightning cannot receive buffs to its pierce, and cannot damage Purple Bloons.

Stats

For a complete list of Druid stats, see Stats:Druid (BTD6).

This data was last updated for: version 55.1

Tower
Display range 35 units Footprint radius 7 units Targeting options First Last Close Strong

Attack
Cooldown 1.1s Offset (X, Y, Z) -3.52, 6.06, 7 Targeting Depends on targeting option Targeting range 35 units Filters Cannot target Camo
Projectile Count 5 Angle 25° Pierce 2 Damage 1 Damage type Normal Speed 340 units/s Lifespan 0.3s Radius 0 units Filters Cannot hit Camo

Lightning
Cooldown 2.3s Offset (X, Y, Z) -3.52, 6.06, 7 Targeting Depends on targeting option Targeting range 35 units Filters Cannot target Camo
Lightning Pierce 5 Max pierce 5 Damage 2 Damage type Plasma Bounce distance 86 units Radius 0 units Filters Cannot hit Camo Ignores blockers

2-1-0

Attack
Offset (X, Y, Z) -3.52, 6.06, 7 ↓ -1.99, 8.17, 7
Projectile Count 5 → 8

2-2-0

Attack
Pierce per extra life +1% Max extra lives for pierce 100
Projectile Now removes Regrow

Lightning
Pierce per extra life +1% Max extra lives for pierce 100
Lightning Now removes Regrow

2-0-1

Tower
Display range 35 units → 45 units

Attack
Offset (X, Y, Z) -3.52, 6.06, 7 ↓ -1.99, 8.17, 7 Targeting range 35 units → 45 units
Projectile Lifespan 0.3s → 0.4s

Lightning
Targeting range 35 units → 45 units

2-0-2

Attack
Speed per life lost +1% Speed per life lost base bonus +10% Max lives lost for attack speed 40

Lightning
Speed per life lost +1% Speed per life lost base bonus +10% Max lives lost for attack speed 40

Costs and sell values

Note: this list does not factor in Monkey Knowledge or other discounts.

Tiers	Total cost				Sell value
	Easy	Medium	Hard	Impoppable	Easy	Medium	Hard	Impoppable
2-0-0	$1,365	$1,600	$1,730	$1,920	$956	$1,120	$1,211	$1,344
2-1-0	$1,575	$1,850	$2,000	$2,220	$1,103	$1,295	$1,400	$1,554
2-2-0	$1,875	$2,200	$2,380	$2,640	$1,313	$1,540	$1,666	$1,848
2-3-0	$2,770	$3,250	$3,515	$3,900	$1,939	$2,275	$2,461	$2,730
2-4-0	$6,935	$8,150	$8,805	$9,780	$4,855	$5,705	$6,164	$6,846
2-5-0	$36,685	$43,150	$46,605	$51,780	$25,680	$30,205	$32,624	$36,246
2-0-1	$1,450	$1,700	$1,840	$2,040	$1,015	$1,190	$1,288	$1,428
2-0-2	$1,705	$2,000	$2,165	$2,400	$1,194	$1,400	$1,516	$1,680
2-0-3	$2,215	$2,600	$2,815	$3,120	$1,551	$1,820	$1,971	$2,184
2-0-4	$4,215	$4,950	$5,355	$5,940	$2,951	$3,465	$3,749	$4,158
2-0-5	$42,465	$49,950	$53,955	$59,940	$29,726	$34,965	$37,769	$41,958

Strategy

This strategy section is empty or incomplete. See the strategy guidelines for more information on how to write strategy sections.

Heart of Thunder's lightning assists with dealing high damage to lots of bloons. However, the lightning forks tend to favor hitting bloons across the entire map instead of focusing close to the Druid, which limits its cleanup reliability, and Heart of Thunder as a crosspath is insignificant on Tier 3+ middle path Druids. 2-2-0 crosspath is okay for de-regrow, though the x-3-x usually is sufficient de-regrow on most maps.

Update history

For a complete list of Druid changes, see Update history:Druid (BTD6).

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Version 18.0

2-2-0, 2-3-0, 2-4-0, 2-5-0

•  Heart of Oak now allows the lightning attack to remove Regrow (undocumented)

Version 27.0

“

[B]y popular demand Avatar of Wrath’s 205 crosspath will now benefit from improved Lightning damage proportional to the RBE of Bloons on screen similar to the main thorns.
— Update notes

”

2-0-5

•  Now grants a slight portion of its RBE damage bonus to the Heart of Thunder lightning chains as well equal to 1 damage for every 6000 RBE on screen with a cap of +15 damage

Version 28.0

“

As an underused crosspath on this tower, Druid’s Hard Thorns will now allow them to counter all of its weaknesses instead of just frozen targets.
— Update notes

”

•  Main attack: Damage type changed ― Shatter → Normal

Version 30.0

•  Overall cost reduced by $25 (due to cost changes for previous tiers)

Version 32.0

2-3-0, 2-4-0, 2-5-0

•  Hard Thorns now changes the damage type of thorn piles to Normal
  •  Thorn pile damage type is effectively the same with this crosspath as before this change

Version 33.0

“

Top path Heart of Thunder doesn’t scale well with tiers for an upgrade with such niche use & generally feels lacking, so it is seeing general power improvements across the board to upgrades that incorporate this attack.
— Update notes

”

•  Lightning attack: Damage increased ― 1 → 2

2-0-5

•  Avatar of Wrath applies more RBE-based damage scaling to Heart of Thunder ― +1 per 6,000 RBE → +1 per 3,000 RBE

Version 37.0

“

Avatar of wrath doubles the base attack speed before any scaling is applied, but this hasn’t ever applied to the 205 Lightning, so taking care of that as well.
— Update notes

”

2-0-5

•  Avatar of Wrath now doubles the attack speed of the lightning attack

2-3-0, 2-4-0, 2-5-0

•  Hard Thorns now allows thorn piles to damage Lead and frozen
  •  Damage type with this crosspath is effectively the same as before

Version 41.0

“

Hard Thorns is useful and often taken for crosspath even if not going for 2xx as lightning is comparatively very expensive for what it offers so moving Thunder’s cost out into both the surrounding upgrades.
— Update notes

”

•  Upgrade cost reduced ― $1,000 → $850
  •  Overall cost reduced by $50 (due to cost changes for previous tiers)

Version 44.0

2-5-0

•  Vine minimum cooldown increased ― 0.0625s → 0.65s (undocumented)

Version 48.0

“

Druid projectile lifespans are being shifted from many base weapons into the xx1 range crosspath, this is a nerf to top path lifespan when not taking the crosspath and a buff to 031 druids
— Update notes

”

•  Main attack: Max projectile distance reduced ― 136 units → 102 units

Version 55.0

•  Main attack: Projectile spread can now be affected by accuracy buffs

Gallery

For more Druid images, see Gallery:Druid.

Screenshots

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Assets

• 
  Portrait
• 
  Upgrade icon
• 
  Insta Monkey icon

In other languages

Language	Name / Description	Notes
Arabic	قلب الرعد إطلاق العنان للانفجارات المنتظمة من البرق المتشعب الذي يمتد من بالونة إلى أخرى.	—
Danish	Tordenhjerte Udløser regelmæssige lyn, som vandrer fra bloon til bloon.	—
German	Donnerherz Setzt regulär Gabelblitze ein, die einen Bogen von Bloon zu Bloon bilden.	—
Spanish	Corazón de trueno Desata estallidos regulares de rayos bifurcados que van de bloon en bloon.	—
Spanish (LA)	Corazón de trueno Desata estallidos regulares de rayos bifurcados que van de bloon en bloon.	—
Finnish	Ukkossydän Ampuu säännöllisesti haaroittuvia salamoita, jotka kulkevat valokaaressa bloonista blooniin.	—
French	Cœur de tonnerre Déclenche des explosions régulières d'éclair ramifié qui passe de Bloon en Bloon.	—
Italian	Cuore di tuono Rilascia a intervalli regolari scariche di fulmini biforcuti che spazzano via i bloon.	—
Japanese	雷の心 ブルーンからブルーンへと弓状に稲妻の一定間隔の爆破を発動する。	—
Korean	번개의 심장 이 풍선에서 저 풍선으로 갈라지는 벼락을 주기적으로 방출합니다.	—
Dutch	Hart van Donder Schiet regelmatig gevorkte bliksemschichten af die van Bloon naar Bloon schieten.	—
Norwegian	Tordenhjerte Utløser jevne bølger med lynnedslag som sprer seg fra bloon til bloon.	—
Polish	Serce grzmotu Uwalnia regularne uderzenia rozwidlonych piorunów, które rozciągają się od blona do blona.	—
Portuguese (Brazil)	Coração de Trovão Libera rajadas regulares de arcos relâmpago que saltam de Bloon em Bloon.	—
Russian	Громовое сердце Регулярно пускает заряды молний, которые передаются от шара к шару.	—
Swedish	Dunderhjärtat Avlossar regelbundna attacker med blixtar som hoppar från Bloon till Bloon.	—
Thai	หัวใจสายฟ้า ยิงสายฟ้าออกมาเป็นระยะ สามารถชิ่งไปยังบลูนลูกอื่นได้	—
Turkish	Yıldırım Merkezi Düzenli olarak Bloon’dan Bloon’a kavis çizen çatallı yıldırım patlamaları yayar.	—
Chinese (simplified)	雷霆之心 在气球之间释放常规的叉状闪电冲击波。	—
Chinese (traditional)	雷霆之心 施放常規的分叉閃電波，弧光從一個氣球彈到另一氣球。	—
This list was last updated for: version 43.1