Other Aspects
The brains of the Shan have six lobes, giving them the ability to follow three trains of thought simultaneously. Most Shan have an aversion to sunlight because the electromagnetic frequency of the Sun's rays poisons their metabolism.
As a result of contact with Azathoth—the head of the mythos pantheon—the Shan developed the ability of Kirlian Phasing, allowing them to pass into the skulls and brains of organic life. On Earth, they usually meld with their new favorite hosts, humanity. Once ensconced within the cranium of a human victim, they use cruel alien telepathy to gradually dominate and control their puppet.
The psychology of the Insects from Shaggai is completely alien, lacking any recognizable human ethics. Other than a few heretics, the Shan are divided into two factions: Fanatical worshippers of Azathoth's avatar Xada Hgla that wish to eliminate all other sects and consider other deities to be inferior or false, and a faction of amoral hedonists whose main purpose is to discover new experiences, most of which involve cruelty or depravity. Their sadistic fancy is often implemented through a host, preferably a sentient one, from which they feed off the electromagnetic impulses in the brain. The relationship is completely parasitic. As long as it inhabits a human host, the Shan has some control over the host's actions, and the longer it is there, the more control it gains. It can, however, be driven out by trepanation.
Read more about this topic: Insect From Shaggai
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