The Surtr was the Concordiat codename for the Melconian preferred heavy ground unit. It is a tracked unit, larger than most Bolos, and armed with six Hellbores in two turrets. Unlike the Bolo Surtr do not have autonomous AI to direct them and their crews are not capable of the same reaction time and precision. As a result Surtr are individually inferior and typically require a two or three-to-one numerical advantage to defeat a Bolo.

Standard Melconian deployment is to operate a Surtr alongside two Fenris units in a Fist. Three Fists constitute a battalion and a Melconian armored regiment has two line battalions.