The ornithopter was a goblin war machine, a flying terror, roaming the skies, with a surprisingly low production rate.
The goblin artificer, Gogma GreenThooth, invited the machine around 8,300BBB. The thopter was very easy to operate, and goblins often mounted it, in their first Golden Age. The thopter was unable to provide offense in battle, unless was modified o a goblin mounted it.
At the Great Battle of Port Heaven, in 8,100BBB, ornithopters were used as a distraction, so goblins, on gliders could jump from the mountains, pelting the enemy Minotaurs with rockets.
When the goblins were enslaved by the dwarves, most of the thopters were destroyed, so the dwarves would not be able to use them.