SCP-11113, codenamed "Thunderclap," is a dormant Keter-class anomaly that takes the form of a Challenger 2 tank. The origins of SCP-11113 are shrouded in mystery, with records indicating that it was recovered from a military testing ground in ████████, United Kingdom.

The tank itself appears outwardly as a standard Challenger 2, but its anomalous properties manifest when it is activated. SCP-11113 exhibits a form of psychic resonance, emitting low-frequency vibrations that induce intense feelings of fear and paranoia in those nearby. This effect extends to both living organisms and electronic devices, causing widespread panic and chaos.

Attempts to contain SCP-11113 have proven challenging due to its ability to phase in and out of reality. When not in an active state, the tank becomes intangible, making physical containment impossible. Furthermore, it has shown a propensity to appear unexpectedly in various locations, often causing havoc before disappearing once again.

The true nature of SCP-11113's purpose and its connection to military experiments remain unknown. Some speculate that it was part of a clandestine project aimed at weaponizing psychic phenomena, while others believe it to be a remnant of a failed ritual or experiment gone awry.

Until further research can be conducted, SCP-11113 remains in a dormant state under strict containment protocols, monitored closely for any signs of activity. Its potential for widespread psychological manipulation and destabilization warrants extreme caution in handling and studying this enigmatic anomaly.