Tomes

Liber Ivonis
... an enormous volume, handwritten in Latin, but so rotten and worm eaten that whole sections no longer can be understood."

initial reading of this book (requiring either a Read Latin skill of 50% or more, or a successful Read Latin roll) will take a minimum of three hours.
If an investigator takes the time to do this then have that investigator gain 2% Cthulhu Mythos knowledge (and reduce Maximum Sanity by the same amount

The Book of Dreams
Greek, 1658, author unknown monk
• Sanity Loss: 1D6
• Cthulhu Mythos: +2/+4 percentiles
• Mythos Rating: 18
• Study: 15 weeks
• Spells: Prepare Te Body (Flesh Ward variant), Travel To
Dream Lands (Mind Transfer variant)
Full study might allow the reader to modify the Travel To Dream
Lands spell to banish the entity (if it had already passed through
into this world); however, there is not enough time this in this
scenario to accomplish this.
Spells
Prepare Te Body (Flesh Ward variant)
• Cost: variable POW; variable CON; 1D4 Sanity points
• Casting time: 2 weeks
Creates magical armor around the caster. Unlike Flesh Ward (page 259,
Call of Cthulhu Rulebook) the armor endures and does not deplete each
round (as the protection is ablated). Tis version of the spell is costly,
requiring 10 POW and 10 CON per point of protection provided. Te
caster must, through scarifcation, inscribe "swirls" on his or her body.
When the caster is struck, the swirls glow with a pale blue light and
reduce any damage by the amount of protection invested.
Te scarifcation is usually applied over a length of time, so
the caster, if they choose, may elect to forego applying the effect
to certain areas (such as the head) to speed up preparation for
the spell. Areas not covered with the required scarifcation are
unprotected by the ward.
Travel To Dreamlands (Mind Transfer variant)
• Cost: 10 magic points; 1D10 Sanity points
• Casting time: 5 rounds
Tis variant purports to permanently send the consciousness
of the caster to the Dreamlands, leaving their physical body an
empty shell. Tis version of the spell is, in fact, a trap. Te caster
must "render thy body still," a euphemism for suicide, which must
be performed with an obsidian knife. With the caster dead, an
external entity can now take possession of the caster’s body while
the caster’s consciousness is transported to goodness knows where.

The Corbitt Diaries

The Corbitt Diaries are in English, though sometimes strangely phrased. The three volumes take a total of two days to read, adding +4 to Cthulhu Mythos skill, and losing 1D4 Sanity points.
The diaries describe Corbitt’s various occult experiments, including the summoning of some unearthly spirit and other magic, and clearly describe a spell entitled ‘Call Forth the Opener of Ways" (an alternative title for the spell Summon/ Bind Dimensional Shambler). No other spells exist in the diaries. The spell takes 2D6 weeks to learn after the diaries have been read