From the release:
We are happy to announce the release of our brand new Imperial Siege Mortar.
This baby comes in 17 parts, is easy to assemble and will be quickly ready to blast away at your foes.
Invaluable for boosting your troops' morale, providing you don't actually shoot at them (I'm looking at you, goblin 'snipers'). Plus, the calliber is so large, if it does not work on the table, you can drink soda from it.
Or plant flowers inside. The possibilities are endless.