Veserab

A veserab was a large, worm like creature with bat wings and a large leech like maw lined with teeth.

Combat
They could also and spew a highly corrosive acid in battle.

Ecology
The monster was used as a mount by shadovar soldiers. They bonded to a rider and were fiercely loyal to that rider, as long as they lived. These creatures could travel long distances hunting and feeding on the wing.