Smaller ones were killed outright by the light, larger ones proved unable to harm their hosts and were harmlessly absorbed by the body as nutrients.

Drochs were parasitic insects that burrowed under beings' skin and drank their life energies and intelligence. Their feeding was the source of Death Seed plague.

Drochs could mimic the host's electrochemical fields and tissue composition, allowing them to avoid detection by essentially becoming part of the host while drawing life from them.