Siege Onager

The Siege Onager is an improved form of the Onager in Age of Empires II. Aside from the different statistics and cosmetic look, Siege Onagers are the same as Onagers in design and function; although they are the only unit outside of the Trebuchet to be able to cut down trees (before The Forgotten Empires expansion).

Siege Onagers are only available to the Aztecs, Celts, Koreans, Mongols, Saracens, Slavs, Teutons, Malians and Ethiopians.

Tactics
Like the Heavy Catapult from Age of Empires, the Siege Onager can attack trees to eliminate them, does an extreme amount of damage (as it is able to bombard troops and buildings), and is one of the most powerful siege weapons. It is more effective at this task than the Trebuchet due to its large area of attack and is comparatively more accurate. It has more hitpoints, attack, and pierce armor than the Onager, and like its lesser cousins may be used very effectively against infantry or archers. The ability to cut down trees makes the Siege Onager a highly valuable unit in maps where there are large areas of forests that may wall an opponent.

Like it's predecessors, The Siege Onager is usually paired with Infantry or melee units for protection ( and in this case those units must be set up to a Defense stance) or with other ranged units to increase their efficiency when attacking

Civilization bonuses

 * Aztecs: Siege Onagers are created 15% faster.
 * Celts: Herdables cannot be stolen within a Siege Onager's Line of Sight. Siege Onagers fire rate 20% faster.
 * Slavs: Siege Onagers are 15% cheaper.

Team Bonuses

 * A team containing Celts: Produce Siege Onagers 20% faster.
 * A team containing Teutons: Siege Onagers are more resistant to conversion.
 * A team Containing Koreans: Siege Onagers +1 range.

The Conquerors Changes

 * Siege Onagers move 0.1 faster.
 * Siege Onagers gain +12 Bonus damage towards Siege Weapons.

The Forgotten Changes

 * A team Containing Koreans: Siege Onagers minimum range reduced (instead of +1 range).
 * Celts: Imperial age unique technology Furor Celtica gives to Siege Onagers 40% more hp instead of 50%.

History
''The siege onager was the largest upgrade of the onager line of weapons. It had the longest range and did the most damage.''

Trivia

 * The cost to upgrade Mangonels to Siege Onagers is 2,250 food and 1,500 gold; making Mangonels the most expensive units to upgrade.
 * Despite the description given in the manual for the Siege Onager, the unit does not have any additional range over the Onager both having exactly the same range.