Wraithknight
The Wraithknight is a massive Wraithbone construct, towering even over the tall Wraithguard and massive Wraithlord. They can be armed with a pair of massive fuck-off Wraithcannons, a Suncannon or a Scattershield and a huge Ghost Glaive.
They are for the Eldar what the XV-104 Riptide and Dreadknight are to the Tau and Grey Knights, except less stupid in the case of the latter. It is an enormous model and a lethal one, making it a massive fire magnet in a more literal way than usual. While it's WS and BS are kind of meh (both 4), it's a Jump Monstrous Creature with S 10 and 5 attacks and I 5. It's impressive in defence but not too much: T8, 6 wounds and 3+ armour; also the option of a 5++ blinding anyone at 6" each time it saves this way. Cool, but sort of disappointing. Deepstrike it for that :O look on the other guys face.
Like other wraithbone constructs, Wraithknights are animated by souls of dead Eldar. Wraithknights are special because they also have pilots; in particular, the pilot must be the twin of the soul animating the machine. It seems that the modeller must have been watching Evangelion the night before designing the Wraithknight; also note the Eva fins on the shoulders and compare the default Saim-Hann colour scheme to Unit-02.