Nephilim Jetfighters are sleek aircraft deployed from the fighter bays of The Rock or any of the Dark Angels' Strike Cruisers. Although sometimes given the task of escorting Thunderhawk gunships to their drop sites, the main role for the Nephilim is as an interceptor intended to establish air superiority over the battlefield, allowing their brethren to concentrate on ground targets with little concern for aerial assault. Nephilim Jetfighters have only been used by the Dark Angels since the late 40th Millennium, when the Standard Template Construct data for the improved engines which distinguish this aircraft was discovered while hunting a suspected Fallen, Baelor the Imposter, in the Nephilim Sector. Designated the Lionheart Engine, the technology was used to modify older Imperial fighter