Concept: Teleportation Tracing

Teleportation tracing is achieved by Leray agents through the use of an invisible aura link that can momentarily describe the current and destination/predestination coordinates of an existing open node of a teleportation symbol. The ability is not easy for agents to learn, and must often be attempted quickly since teleportation symbols do not last very long. Agents only use this to investigate a recently discovered teleportation symbol that is unregistered or considered unauthorized, often by criminals who are using that power for the wrong reasons. Once traced, the destination of that target will be known, even if the agents are unknowingly focusing on the exit node.
Teleportation tracing has one particular drawback: this ability does not work on dark magic. To be specific, teleportation symbols and long-range teleportation can be invoked in all of the same ways while using or relying on an internal source of dark magic formats to accomplish this ability. When this happens, the often bright blue teleportation symbol on the ground turns to a blood red color, an artificial effect of the veil. The problem is, dark magic teleportation symbols usually block all attempts of being traced even though both nodes remain open for the same amount of time as ordinary nodes. In effect, dark magic teleportation is effective in preventing agents from using teleportation tracing on those symbols.