The Onager is the upgrade of the Mangonel, a catapult-like siege weapon firing grapeshot. It has more hitpoints, a greater splash radius and attack, and fires farther. The Onager upgrades to the Siege Onager.
Unfortunately for the Bretons and Genoese, they do not receive the Onager. Genoese players should consider using their cannons as a substitute.
Built at: Siege Workshop
Cost: 160 Wood, 135 Florins, 3 population slots
Armor/Pierce Armor: 0/12
Range: 9 (MR 3)
Special: +45 vs. buildings, +12 vs. siege weapons.
Upgrade of: Mangonel
Cost: 800 Food, 500 Florins
Upgrades to: Siege Onager
Cost: 1450 Food, 1000 Florins