The Widow Mk. III is TESSERA's contribution to the spider-platform arms race — a four-legged area denial automaton that doesn't chase targets but waits for them. The unit deploys to a designated location, anchors itself to the ceiling or wall using adhesive pads and mechanical clamps, then enters a dormant state that can last weeks. When its sensor suite detects unauthorized movement within its kill zone, it activates with zero warm-up time, dispensing a burst of monofilament wire from spinnerets mounted beneath its chassis. The wire, thinner than human hair and strong enough to sever unaugmented limbs, creates an instantaneous web across corridors and doorways.

The Widow's genius — and horror — is its patience. Unlike aggressive pursuit platforms, it imposes no energy cost on the deploying force. It simply waits, consuming negligible power in dormant mode, until something enters its space. TESSERA markets it as a 'persistent denial asset,' which is corporate language for a machine that turns rooms into death traps indefinitely. Recovery teams entering areas where Widows have been deployed must sweep every surface above eye level before proceeding.

The Mk. III variant added a secondary capability that has drawn particular condemnation: acoustic luring. The unit can replay recorded human vocalizations — distress calls, crying, calls for help — to draw targets into its engagement zone. TESSERA's documentation describes this as 'target vectoring through acoustic stimulus.' Everyone else calls it bait.