Eagle Claw Bolt Thrower

The Lothern Sea Guard are masters of the Eagle Claw Bolt Throwers that not only play pivotal roles upon the battlefield, but also bristle from the sides of Ulthuan's warships and the battlements of her fortresses. Eagle Claws can be found not only in Lothern, but throughout the Ten Kingdoms. The Bolt Thrower's canny design allows its crews o alternate fire modes at need: it can loose single shots capable of disemboweling a rampaging Giant, or clutches of six lesser bolts to mow down massed infantry before they reach the High Elf lines. Such is the skill of its Sea Guard crew, and the speed with which they reload, that only seconds separate one deadly volley from the next.

Source

 * Warhammer Armies: High Elves (8th Edition) -- p. 42.