 Item Number- SCP-3841 Object Class- SAFE Special Containment Procedures- Cover stories attributing the debris ring around light and B to asteroid impacts and other non-anomalous stellar phenomena have been disseminated. Discovery of SCP-3841 by civilian astronomers is impossible due to the planet's atmospheric haze. However, in the event this does occur, any resultant research will be discredited by Foundation-run academic journals, which will publish their own papers presenting different explanations for the discoveries. Amnesticization of involved persons may be performed if deemed necessary. Four monitoring satellites and surface observation probes have been deployed by Foundation extrasolar exploration vessels to monitor light and B for signs of further activity. Light and B is classified as off-limits for potential human interstellar colonization in the near future. Description- SCP-3841 designates the remnants of a halted K-class event, K-3841, that occurred on the exoplanet Light and B at an unknown time in the recent past. The exact details of the event are unclear, though it is known to have resulted in the extinction of all life on Light and B, including its native sapient civilization hereafter Lightenians. The primary cause of K-3841 is presumed to have been SCP-3841 Omega. An organism whose skeletal remains span two continents on Light and B. The cadaver is 3,300 kilometers long and is hexapedal in nature, similar in structure to the bodies of Lightenians, with the frontmost two legs possessing feet that could act as graspers. When alive it likely had a skull with the same structure of Lightenians skulls, having two lower jaws and an upper jaw. But the entire head region has been destroyed. Fragments of it have been found in craters across the planet, in orbits around Light and B, and in orbits around Light and Star at the escape velocity of Light and B. Surrounding the lower portion of the skeleton is a crater with a 300 kilometer radius, likely the site where SCP-3841 Omega began its formation. The hind legs and tail structure of the skeleton are incomplete, suggesting that the organism had not fully formed when it expired. What anomalous means the organism used to stay alive in spite of its size are unclear. What substance forms the skeleton is unknown. No tools such as drills and laser carvers have penetrated its surface, and no amount of applied heat or force have caused damage. Decaying organic matter is attached to the sides of the skeleton, holding some sections together, which progressively converts into a reddish-brown slurry of organic chemicals that falls from SCP-3841 Omega. This currently covers much of the region surrounding SCP-3841 Omega, filling former lakes and oceans. The last of the matter attached to the skeleton is expected to finish decaying in 50 years. Other structures of anomalous origin have been discovered in the vicinity of SCP-3841 Omega. Exploration teams investigating Lightenian cities found several structures of concentric circles formed from thousands of Lightenian cadavers, all of which had been attached by fusion of the limbs. Skyscrapers, primarily those ringing the crater, have calcified organic growths formed from fused Lightenian bodies that extend in directions away from the crater's epicenter. These reach lengths of up to 0.6 kilometers and heights of up to 1 kilometer, many having collapsed in recent years. Symbols of potentially thomic nature are also carved into mountain ranges, islands, and remaining skyscrapers. Lighten B is barren as a result of K-3841. No living fauna, flora, and a microscopic life have been found, and all regions previously containing liquid are entirely dry. CO2 and methane are the most abundant atmospheric gases, forming a dense haze that encompasses the planet and blocks light from Lighten's star. Atmospheric conditions and radiation levels are consistent with those of global nuclear fallout. A gradually dissipating debris ring of rocky matter orbits Lighten B. Its origins are uncertain. Little knowledge exists on Lightenian civilization. Present observations indicate that they had reached the same level of technological advancement as modern humanity, though what culture they had has not been determined. Book-like objects and the remnants of computer systems have been uncovered, but have all contained cognitohazardous depictions of SCP-3841 Omega that induce vegetative states in organisms that view them. All Lightenian cadavers discovered to date lack a brain-equivalent organ, despite the presence of empty spaces in their skulls where a brain could reside. Most cadavers were found with their heads pointing in the direction of SCP-3841 Omega's crater. While the exact events of K-3841 are not understood, hypotheses have been proposed to explain the death of SCP-3841 Omega. Initially it was believed that mass nuclear bombardment of the head caused its destruction, which while potentially an explanation for the nuclear fallout, was ruled out after tests with nuclear equipment failed to damage recovered skeleton fragments. No other known weaponry possessed by the Lightenians could have caused the damage. The leading hypothesis is that, during the formation of SCP-3841 Omega, it gained such a mass that it generated a gravitational field sufficient enough to alter the orbit of a small moon of Lighten B. Continued alterations from the field and further size growth led to the moon's orbit intersecting with SCP-3841 Omega, resulting in it directly impacting the head. The accidental death then halted K-3841. This is consistent with the existence of the debris field and the widespread of skull fragments. Lighten B is not expected to be habitable for the next thousand years, if ever. Addendum 1. SCP-3841 Omega Decay Slurry Alterations From 2030 to 2033, probes that had been continually analyzing the chemicals in the SCP-3841 Omega Decade Matter Slurry detected increasing quantities of chemicals similar in nature to amino acids. RNA and DNA equivalent structures emerged soon after. In 2034, the first single-celled organisms were observed, and as of 2035, colonies of multicellular organisms have formed in the slurry and the land bordering it. The colonies primarily convert CO2 to O2. Additional probes and monitoring devices are scheduled for deployment on Lighten B. Previously predicted time spans for habitability are under reconsideration.