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Void effects cause this experimental drive to produce a purple contrail under boost.
Permanently upgrades an equipped Rare Sparrow to improve speed and durability.
― In-game description

A Void Drive increases both speed and durability of a Guardian's equipped rare Sparrow and turns the boost contrail purple. The upgrade is a one-use consumable item that transforms the equipped rare Sparrow into a legendary Sparrow. It can be purchased from Xûr.