Probe

The probe is a non-obtainable unique spacecraft appearing in the battle tutorial only. You'll be fighting this on your way to Trenzalore.

The shape is reminishent of a Sputnik 1,the first artificial satellite in Earth's orbit,which suggests it's outdated and likely abandoned,roaming in the depths of space. Yet again,it has low relevance shielding and a formidable speed. The high speed might be explained by the "slingshot effect",an exploiting of gravity used to propulse surveyors at great speeds without consuming too much fuel.