These arcane tools come in the shape of large blades attached to poles or implanted directly into the Warlock's arms, with many wires and cables feeding them the warp energy accumulated by him.
Source: Warhammer Fantasy: 6th Edition
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The warp-blades give the bearer +1 Strength and allow him to cast the Warp Lightning spell through them. Note that this only provides the bearer with the knowledge of the spell, but the player must spend Power dice to cast the spell as normal.
Warp-blades are Warpstone Weapons.