Bone Catapult/1.03

Bone Catapults are siege weapons.

They are an inferior variant of the standard Catapult. The main reason is their range: while range 12 would be great for any other unit, for a siege weapon it's poor. This means that they have trouble out-ranging even un-garrisoned towers, and with only 60 damage, they won't be able to pull off much damage before said tower makes short work of the Bone Catapult's low HP.

=Factions=

Plaguelords
Plaguelords are lacking in the range department, and a long range splash attack can work well for them in the form of artillery. With Slimes and Ghouls pinning the enemy down, Bone Catapults can rain death upon them, dealing the threatening damage that makes up for the lack of offense from the aforementioned units. Impressively, Bone Catapults are available at tier 2 for Plaguelords, where other races usually have to wait to tier 4 to get their siege weapons. This allows you to field them very early on where there's no much that can directly counter them.

As for building destruction, Spores and Eyes of Flame can do a quicker job, but Bone Catapults with a Hydra meet shield can do the job more safely, being able to absorb common arrow attack and thus being more cost efficient.

The Swarm
The Swarm aren't exactly short of units to dispose of buildings and the ones they use can hide behind a wall of Husks to save them from tower fire. Further more, The Swarm is a fast passed race that simply don't have time to wait for siege weapons to travel across the map. If you do plan on using Bone Catapults for tower smashing, then you'll still need to bring in Husks, anyway. This is because the Bone Catapult's range is only 12, which has trouble out ranging even un-garrisoned towers. You're probably better off using Scarabs and Scorpionpriests for all situations that you would contemplate using a Bone Catapult for.

Benefits from Eagle Eye research.

Undead
Ironically, the Undead have little use of this Undead unit. If you want to raze buildings of all types, then Liches are the units for the job - not to mention that you'll be fielding them anyway due to how much of an important role they play with Undead.

Benefits from Dark Mithril research.

Quotes

 * Ready: "Bring me the skulls of my enemies!"