Special Containment Procedures: The entrance to SCP-XXXX is contained at its location of discovery. To prevent civilian access to SCP-XXXX, a 1km perimeter has been established around SCP-XXXX, with barbed wire fencing an routine security patrols. Unapproved individuals approaching SCP-XXXX are to be detained and turned over to local authorities. Cover story XXXX.19 "Uncontained Chemical Waste Spill" is to be disseminated within the local community.

Any humanoid entities emerging from SCP-XXXX are to be held in containment for analysis, and then returned to SCP-XXXX. Per Foundation Compliance Agreement XXXX-Flagstaff, any quadrupedal entities emerging from SCP-XXXX are to be met with lethal force unless otherwise authorized by extant articles of FCA XXXX-Flagstaff.

Ethics Committee Memorandum: Foundation Compliance Agreement XXXX-Flagstaff is currently under review. Until such time as a consensus can be reached, the Compliance Agreement is temporarily suspended.

Description: SCP-XXXX is a spatial anomaly located 3.4km northeast of Centralia, Oklahoma, USA. The anomaly presents as a opaque distortion in the air, roughly 5m tall and 3.2m wide. The distortion produces minor amounts of electromagnetic interference in electrical equipment, though this effect is not so pronounced as to damage more robust systems.

Beyond SCP-XXXX is a planet within an alternate dimension (currently classified as XXXX.Ada1) populated by numerous species that exist on Earth. Genetic tests performed on entities found within XXXX.Ada have confirmed near-relatedness to Earth-born species, though minor differences are present. The most significant difference between Ada and Earth, aside from differences in the geographical makeup of the planet beyond SCP-XXXX2, is that human beings are not the dominant species on Ada. Instead, the dominant species on Ada is a species of large, quadrupedal entities that resemble modern horses (Equus ferus caballus).

According to information gathered from sources within SCP-XXXX, human beings (which exist within XXXX.Ada and bear close genetic similarity to modern humans) were domesticated by these horses (self described as "The Equus") during prehistory, when the first group of Equus - led by a legendary being named "Xanthos"3 - approached the humans and made a pact of cooperation with them. Over time, due to the increased perils on Ada, this cooperation became subservience, and humans on Ada now act as a servant class to the more powerful Equus.

The Equus entities (classified collectively as XXXX.E-Equus) appear similar to Earth-born horses, with several significant differences. Equus are significantly larger than Earth horses, with most standing higher than 4m and several members of the ruling class - such as the Equus general Man of War and the god king Secretariat - standing more than 11m. Additionally, Equus are significantly stronger, both in physical strength and strength of their hide and internal structures. It is believed that prehistoric Ada humans became subservient to the Equus in part due to their considerable weakness in comparison4. Lastly, Equus are both sentient and sapient, at least at the level of modern Earth humans and in many cases noticeably more. The increase in intelligence is believed to be in some way related to their increase in size, as the brains of the Equus are likely much larger than their Earth counterparts. This has allowed the Equus to both dominate their environment (specifically through the use of their human builders) and command the use of speech, which they do so in an unknown language5.

XXXX.Ada is home to several other sentient species of animal, living in a complex and, at times, hostile ecosystem. More information on the inhabitants of XXXX.Ada can be found in Addendum XXXX.2.

Addendum XXXX.1: Discovery

SCP-XXXX was discovered by Foundation agents after a report of a building-sized horse walking the streets of a local town was picked up by local authorities. The entity, later determined to be one of the Equus, engaged briefly with authorities and later Foundation agents before entering into a diplomatic engagement with Foundation personnel.

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