The Ichnaea is a specialized utility structure designed to detect cloaked or stealthy ground units within a large radius. Its passive seismic sensing makes it invaluable for early warning and counter-stealth strategies.

Stealth detection does not reveal a unit directly, but rather draws flashing red circles on the ground around their position, and plays a verbal audio cue. The player can then fire on said circle(s) or move units closer to reveal their position.