A creepy gravitational artifact name Mug among stalkers for its slight resemblance to a human face. Scientists at Scientific Research Institute 7 have long tried to determine its composition and structure but have not reached a consensus. Although each Mug sample looks almost identical, it may actually be composed of different debris. Stalkers noted another feature: two blinking diodes that sync to the heartbeat of the bearer. This similarity of Mug to Heart has spawned many tales among Zone inhabitants.
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