SCP-1104

Item #: SCP-1104
Object Class: Keter
Special Containment Procedures: Complete destruction
 of SCP-1104 is endorsed, should adequate means be developed.  While 
individual instances of SCP-1104 are easily terminated, SCP-1104 is 
endemic to subsurface geological formations in northwestern ████████, 
rendering the (surmised) primary population of SCP-1104 inaccessible to 
convenient lethal agents.  A surrounding area 10km in diameter has been 
designated Site-104 and cordoned from the public under guise of 
endangered species preservation.  Personnel must wear N100 air 
filtration masks while within Site-104.  Mammalian organisms exceeding 
10kg (other than authorized Foundation personnel) entering Site-104 
should be assumed contaminated and incinerated at facilities on-site.
Description: SCP-1104 is a species tentatively 
identified as a member of order Chelicerata.  The life cycle of SCP-1104
 comprises at least two distinct phases, the first being a larval stage 
approximately 0.4mm in diameter.  At irregular intervals, larval 
SCP-1104 are expelled from lava tubes within Site-104 at concentrations 
up to 200 individuals per cubic meter.  These remain airborne for as 
long as 14 hours and have been documented to travel at least ██ km under
 favorable weather conditions.
When inhaled, larvae will adhere to nasal mucosa, where they excrete 
an array of H1 receptor antagonists that suppress both local 
inflammation and implantation of further larvae.  Over a period of 6-8 
months SCP-1104 will grow and extend appendages through the host's 
ethmoidal canals.  Hosts generally remain unaware of the presence of 
SCP-1104, apart from persistent but non-specific headaches.  On 
maturation, SCP-1104 will begin applying pressure to the host's optic 
nerves causing obstruction of the central visual field.  This pressure 
is applied selectively when the host is not oriented toward the local 
gradient of atmospheric hydrogen sulfide, which SCP-1104 can detect 
through the host's inhalations.  After an initial period of distress, 
the host will begin to prefer to face and travel in the directions where
 they do not experience visual disturbances, thus tracing the source of 
hydrogen sulfide.  Upon reaching a zone of sufficient hydrogen sulfide 
concentration, SCP-1104 projects appendages into the host's prefrontal 
cortex, causing unconsciousness during which SCP-1104 exits the host via
 the ocular cavity.  After leaving a host, SCP-1104 attempts to locate 
and enter the source of hydrogen sulfide, such as a lava tube or sewer 
pipe.  SCP-1104's subterranean lifecycle has not been documented.
Although humans display the same instinctual aversion as any animal to 
visual disturbances caused by SCP-1104, the behavioral response is not a
 compulsion, and hosts may defy the influence especially if informed of 
the nature of SCP-1104 (Note that subsequent hostility toward research 
personnel should be anticipated).  Attempts at surgically removing or 
poisoning a fully developed SCP-1104 result in immediate elicitation of 
its exit response.  Post-exit hosts exhibit complete aspontaneity due to
 orbitofrontal lesions, and to date have provided no pertinent 
information in debriefing.
== SCP Reading ==
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Category:Keter
Category:Series II