Stormraven
The Stormraven Gunship is a vehicle used by Space Marines in the wargame Warhammer 40,000.
Space Marines are, at their core, a surgical strike force, and so they have developed many ways of delivering Marines into precise, heavily-guarded locations. The Thunderhawk can carry a relatively large number of Space Marines from orbit, but it is an extremely large, inviting target (and, from a crunch perspective, it is an Apocalypse-only unit). Sometimes, a smaller aerial insertion is what is required, and the Stormraven fills that role.
Tabletop
It used to be that only Grey Knights and Blood Angels armies could take the Stormraven, because apparently, the Stormraven didn't exist when Roboute Guilliman wrote the Codex Astartes, and because the Grey Knights did not seen fit to allow others to use the technical plans in the millennia that they have employed the Stormraven (while the Blood Angels only got their hands on some Stormravens in M41), but when the Death From The Skies Compendium was released the Ultramarines and Black Templars gained access to the Stormraven as well. Why they were never mentioned as having it before, no one knows.
The model was only recently released, around the same time as the new Codex: Grey Knights; its initial entry in Codex: Blood Angels didn't even have a picture. As it was a fairly tough transport capable of taking 12 Marines, it became known as a "flying Land Raider," and was often kitbashed as such.