Blast Furnace is a Blacksmith technology. Infantry, Cavalry and Hulk-line +2 attack.
- Building: Blacksmith
- Age: Imperial Age
- Cost: 275 food, 225 gold
- Research time: 100 seconds
- Available to: 45 of 56 civilizations (11 do not have it).
The Imperial Age melee attack upgrade. With Forging and Iron Casting, melee units gain +4 attack in total.
Figures from the game data for Update 185872 (September 2026), at the time of publishing.