The Hungering of Shadows
System: Pathfinder | SRD
Level: 9
School: evocation
Casting time: 1 day
Components: V, S, M ( lavender and green ioun stone split into 6 shards), F (an onyx throne worth at least 40,000 gp), SC (6)
Skill checks: Knowledge (arcana) DC 47, 4 successes; Knowledge (geography) DC 47, 2 successes; Knowledge (nature) 47, 1 success; Spellcraft DC 47, 2 successes
Range: 10 miles/character level of the primary caster
Duration: instantaneous; see text
Saving throw: none
Spell resistance: none
Backlash: The primary caster gains 2 permanent negative levels, and all secondary casters are permanently blinded and deafened. None of these effects can be removed by any means unless the ritual is reversed.
Failure: The primary caster and all secondary casters are immediately transported to different locations on the Negative Energy Plane or Shadow Plane (50% for either plane, roll separately for each caster). The secondary casters remain catatonic for 1 hour upon arriving.
The primary caster sits upon the onyx throne, invoking ancient rites blaspheming against the light of the sun. The secondary casters offer up prayers to the gods of darkness. In turn, each of the secondary casters consumes one of the ioun stone shards, which induces a state of catatonia for 1 hour. Throughout the ritual’s casting, a localized partial solar eclipse marks the location of the throne with an obvious pillar of darkness from above, easily noticed by creatures throughout the ritual’s area.
If the ritual is successful, the area is draped in a curtain of eternal darkness, removing sunlight from the area. Illumination in the area can never be brighter than dim light, and only a miracle or wish can even temporarily alleviate this restriction (though direct intervention of a deity can end the ritual’s effect). Any light beyond dim light that would touch the area is instead transported into the ioun stone shards consumed by the secondary casters, making the secondary casters’ entire bodies glow. Any object with a light spell having its light thus dimmed by the ritual counts as a part of the secondary casters’ bodies for the purpose of a connection for spells like scrying. Collecting these ioun stone shards then piecing them back together while within the affected area ends the effects of this ritual.
Source: Horror Adventures pg. 132