The Cenotaph Burst Transmitter is a single-use emergency communications device — a hardened cylinder approximately the size of a flare, designed to transmit one compressed message packet across a maximum possible range before destroying itself. Tessera Corponation developed it for deep-cover operatives and isolated field agents who needed a last-resort option when all other communication had failed. The device charges over a period of 60–90 seconds from activation, during which it compresses, encrypts, and fractures the stored message into a multi-frequency burst transmission that fires simultaneously across forty-three frequency bands in a single 0.008-second pulse.

The burst is, by design, impossible to miss and impossible to trace. The transmission is so brief that direction-finding equipment cannot lock a bearing before it ends; the multi-frequency fracturing means no single monitoring system captures the complete message; and the device physically incinerates its own internals after firing, leaving a slag of ceramic and fused circuitry that yields nothing recoverable. Recipients must have a Tessera Cenotaph receiver unit — a small passive module that captures and reconstructs burst fragments across all forty-three bands simultaneously — to decode the message. Without a paired receiver, the burst is unintelligible noise across dozens of bands.

The Epitaph's cultural weight comes from its irreversibility. A device that destroys itself after a single transmission, designed for use when everything else has failed, carries an unmistakable implication. Tessera markets it to corporations for deniable deep-cover operations; the black market sells it to anyone who thinks they might someday need to scream once, very loudly, and then disappear. In GLMZ intelligence circles, receiving an Epitaph burst from a contact is understood to mean one of two things: either they've gone dark permanently, or whatever they've just told you is the most important thing they'll ever say.