Arks
The Arks were a type of warship used by the Dark Elves of Svartalfheim. The Arks were capable of ferrying smaller Dark Elf Harrow fighters, and were powered by dark-matter engines.
Arks are capable of faster than light interstellar travel.
Armor and defense
They are equipped with cloaking devices powerful enough to mask themselves even from Heimdall, though not for much time.
Hangars & docked vessels
They act as carriers, being able to hold several Dark Elf Harrow fighters.