Heavy Onagers are a type of artillery unit in Rome: Total War and Total War: Rome Remastered.
Description[]
The heavy onager is an enormous catapult built using the same basic design as its sibling and capable of smashing down stone fortifications. It is powered by a twisted bundle of animal sinew ropes, and is slow to wind back and reload. Its missiles are devastating, and it can also fire incendiary fire-pots. Range is no more than the smaller onager and this makes the heavy onager susceptible to counter fire. Often, it is best employed alongside smaller artillery to deal with enemy fire.