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Thunderboom Tips

Runesmiths charge the pickaxe with booming thunder, furiously reverberating inside its mithril prison. Upon hitting a hard surface, the prison will crack and unleash earth shattering fury. Bonus calamity damage multiplier. A chance to trigger a lightning strike, which deals additional 25-75% damage.

Main useRunesmiths charge the pickaxe with booming thunder, furiously reverberating inside its mithril prison. Upon hitting a hard surface, the prison will crack and unleash earth shattering fury. Bonus calamity damage multiplier. A chance to trigger a lightning strike, which deals additional 25-75% damage. Chance increased by +1% for each tier of Rune of Power and +0.04% per luck.
When to buySpend mithril here once dens, luck, or forging upgrades are producing enough mithril to avoid delaying the next unlock.
CostGold: 600
Mithril: 1
5 tiers
Active effects
  • Miner Thunderboom Calamity
  • Miner Thunderboom Strike

Runesmiths charge the pickaxe with booming thunder, furiously reverberating inside its mithril prison. Upon hitting a hard surface, the prison will crack and unleash earth shattering fury.

Bonus calamity damage multiplier.

A chance to trigger a lightning strike, which deals additional 25-75% damage. Chance increased by +1% for each tier of Rune of Power and +0.04% per luck.

Gold Cost600
Mithril Cost1
Active EffectsMiner Thunderboom Calamity, Miner Thunderboom Strike
Unlock ConditionRequires at least 4 staffed dwarves in the referenced building.
EffectAdds or upgrades these effects: Miner Thunderboom Calamity, Miner Thunderboom Strike.
  • Miner Thunderboom Calamity
  • Miner Thunderboom Strike
EffectBase ValueTier ValuesPlayer Meaning
Miner Thunderboom Calamity11, 1.12, 1.24, 1.36, 1.48, 1.6Miner Thunderboom Calamity scales its unique trigger for this entry.
Miner Thunderboom Strike00, 0.01, 0.02, 0.03, 0.04, 0.05Miner Thunderboom Strike scales its unique trigger for this entry.
TierGoldMithrilSoul
16001None
220002None
340004None
4120006None
5740008None