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Hardened bolts increases the defense and attack versus infantry of crossbow-wielding units by a single point.

Name Picture Required Research Facility Time Gold Prerequisites Rewards
Hardened Bolts Hardened Bolts Research Icon University - 3 5:33:00 80,000 Crossbowman Improves Crossbowman, Arbalest, and Repeating crossbowman
Crossbows pre hb

The crossbow-using units before hardened bolts is researched

Crossbows after hb

The crossbow-using units after hardened bolts is researched

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