Blast Furnace
Blacksmith - ImperialEvolution
Forging
Feudal
Iron Casting
Castle Blast Furnace
Imperial
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"+2 Attack for infantry & cavalry"
Coach's Tip
Blast Furnace is the Imperial Age melee attack upgrade, providing +2 attack. This is essential for Paladins, Champions, and any late-game melee composition.
Strategic Analysis
Strategic Identity
Blast Furnace is the Imperial Age melee attack upgrade, providing +2 attack. This is essential for Paladins, Champions, and any late-game melee composition.
When to Research
High Priority
Research Blast Furnace as soon as you have the resources and are using infantry units.
Combat Impact
+2 Attack for infantry & cavalry
Affected Units
This technology improves 20 units.
Civilization Access
* 43 civilizations have access to this technology.
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Other Technologies to Explore
AoE Coach analysis
Context & meta
Blast Furnace is the Imperial Age Blacksmith technology for Infantry, Cavalry and Hulk-line units. It costs 275 food and 225 gold and takes 100 seconds to research. The official help defines the effect exactly: Infantry, Cavalry and Hulk-line +2 attack. The affected force must be active in the next fight. It is a build breakpoint: spend now to improve an existing composition. It pays when several affected units are ready. Its timing matters because an upgrade that finishes after the battle cannot change that battle.
History & balance
Blast Furnace uses a compact historical label to describe a long technical step. The furnace vocabulary turns late metallurgy into a clear final step in a long melee technology line. AoE2 reduces that development to one research button, but the concept remains readable: the upgrade changes the way an established tool survives, reaches, or delivers force. This is why it belongs to the technology tree rather than the unit card. The name also gives a useful coaching cue: do not judge it in isolation; judge the equipment line, the building, and the battlefield role that it completes.
In pro play
Use Blast Furnace when your Imperial melee group is already planned and the economy can sustain food and gold. Keep 275 food and 225 gold and the 100 seconds research time in the plan. Infantry, Cavalry and Hulk-line +2 attack. The clean execution is to queue the research before the mass is fully exposed, keep relevant production or defense preparation running where possible, and make the first upgraded engagement deliberate. The classic error is clicking it on arrival to Imperial Age while only one or two affected units exist. If timed well, it changes the next fight.
How to counter it
There is no military unit that counters Blast Furnace; the practical answer is to read the research window. Pressure the research building or fight before completion. Effect: Infantry, Cavalry and Hulk-line +2 attack. The common mistake is clicking it on arrival to Imperial Age while only one or two affected units exist. Track the research building and resource bank; an early click can delay units. If you struggle against this timing without knowing what to produce or when, AoE Coach reads your matchup and gives you the composition and timing.