A Wraithspear is a rare close combat weapon that is a variant of the more common Wraithsword used by the massive war engines known as Aeldari Wraithlords. A Wraithspear is only wielded by the equally rare variant of the Wraithlord known as the Wraithseer. A Wraithspear is an arcane form of the Wraithblade that takes the appearance of a huge staff topped with a massive spearblade surrounded by a Power Field.
Its shaft is studded with Spirit Stones that amplify the Wraithseer's already impressive abilities in close combat. This is because the Aeldari spirits embedded within the gems are a sentience unto themselves that guide the Wraithseer's blows and compensate for the construct's vision-obscuring Wraithsight.
Thus, a Wraithseer is able to cleave apart multiple enemies with alarming grace and skill with each swing of its Wraithspear. A Wraithspear is also designed to be used to greater effectiveness against vehicles than a Wraithsword, and many an enemy tank has been destroyed with a single devastating thrust.
- Imperial Armour 11 - The Doom of Mymeara, pp. 130, 182-185