The Strogg are nourished, fueled and lubricated by a viscous liquid known as stroyent, consisting of processed corpses of their victims and former allies. A system of pipelines, pumps and distribution vessels runs throughout Stroggos, fed at its core by a massive creature known as the Stroyent processing creature, resembling a mutant stomach, which also serves as the stroyent processing plant. Another creature, resembling a giant heart with an attached eye, pumps the vital substance through the pipes. The "donor" for these organs is unknown.
The creature was killed by a lone Space Marine during the later phase of the Stroggos Campaign.