This ritual is a left-over from the titanic wars between the Great Race of Yith and the Flying Polyps. No record exists of it in writing but occasionally a Yithian Memory Crystal is unearthed that contains the instructions. The ritualist need six rock crystals (approximately 1 foot long) inscribed with hyper-dimensional symbols fixed to a complicated three foot high metal structure (somewhat resembling a silvery centipede curled around an umbrella) made out of a precise mixture of Silver and Scandium. 

There are several complications in the creation of the items above :

• The hyper-dimensional symbols are incredibly dangerous if done incorrectly (usually resulting in the severing or disappearance of various body parts) and even if inscribed correctly lengthy exposure to them tend to drive humans insane.
• Scandium is a rare metal not easy to get hold of, originally used in nose-cones on Soviet ballistic missiles. The main source of Scandium is from Soviet Union military stockpiles.
• The precision necessary in creation of the metal structure necessitates the use of several modern and very expensive metal mills and other equipment. Not something you do in your backyard.

After putting together the necessary items the ritual itself is a compareatively easy thing involving touching the crystals in a specific sequence and focusing ones mind on the correct (sanity-cracking) four-dimensional symbols while paying 1 MP for every two rounds the ritual should be active.


EFFECT :

This ritual was meant as a defensive weapon against the Polyps who, being creatures of exotic matter, were hard to damage otherwise. The ritual is directed in a specific direction decided by the ritualist (Don't mess this up!) and affects a cone 1800 feet long and 1200 feet broad at its base . The linearity of reality is severely disturbed in this cone. Non-linear "cracks" will appear, tearing the space-time continuum like wet paper. This will severely damage both structures and living beings in the area. Each round a being (including most Mythos creatures) in the area must succeed with a Dodge-roll (really large entities always fail) to avoid the deadly "cracks" (appearing somewhat like writhing strands of darkness) or take 3d6 damage/Area 10 explosion (the discontinuities separates or disappears flesh) and non-living structures/items approximately the size of a car have a 30%/3d chance of falling apart (larger structures will break down slower, a piece at a time).


SANITY COSTS :

• 1d4/1d8 Sanity (Intensity 8 in The Unnatural) if using a Yithian Memory Crystal to learn the ritual.
• 1d2-1/1d4 Sanity (Intensity 4 in The Unnatural) each hour working with, or within 5 foot of, the Hyper-dimensional symbols. (It takes approximately 8 hour to inscribe each crystal).
• 1d6 Sanity (Intensity 6 in the Unnatural) when executing the ritual.
• 1/1d6 Sanity (Intensity 6 in Helplessnes) when attacked by it.

Credits: Jonas Bolander