The Gravemind Relay Hub is a distributed mesh-coordination device roughly the size of a hardcover book, constructed from Palladian Construction's proprietary stress-ceramic housing. It operates by seeding a local area with micro-relay dust — particles thin enough to drift through ventilation systems and settle on surfaces — which collectively form a self-organizing signal lattice. The hub itself acts as the root node, stitching the dust-relays into a coherent network that can support up to forty-eight simultaneous encrypted voice and data channels across a radius of roughly six city blocks.

What distinguishes the Gravemind from conventional mesh nodes is its passive topology — the dust-relays require no active power draw, harvesting ambient EM bleed from nearby infrastructure to sustain themselves. This makes the network nearly undetectable by standard sweep equipment, as there is no central transmitter to locate. Traffic is fragmented and distributed across hundreds of micro-nodes before being reconstructed at the receiving end, a process Palladian markets as 'architectural encryption.'

The hub is favored by fixers and mid-tier syndicate operations that need persistent comms infrastructure in contested urban zones without the risk of a single point of compromise. Construction crews operating in corporate exclusion zones use them to maintain coordination when standard channels are jammed or monitored. Law enforcement occasionally finds decommissioned units months after an operation has concluded, the dust long settled into the walls.