Resonance spires

Resonance spires are the means by which Ærolith Dynamics' various artificial intelligences relay remote broadcasts to employees' subcortical neural implants. They achieve this by means of relatively harmless high-frequency radiation.

These structures exist on both Typhon and Earth, and establish the effective range at which AI can speak to Ærolith employees. SAYER (in "Near Flawless") and SPEAKER (in "Welcome Back") both demonstrate an awareness of this limitation.