The Mythos Fright Check
When creatures of the Mythos are encountered or the brain twisting thought processes required to fathom hypergeometry are undertaken, the strain on sanity is often too great to bear. This aspect of human frailty displays the fundamental inability of homo sapiens sapiens to comprehend even the slightest hint of reality's true nature without suffering severe mental trauma.
The rules for the Mythos Fright Check are largely identical to the ones found in GURPS Cthulhupunk and to the Sanity Blasting Fright Check found in GURPS Horror.
A Mythos Fright Check is similar to a normal Fright Check, with the following modifications: The maximum bonus to be applied to Will when making a Mythos Fright Check is +4, the benefits of Fearlessness are halved, while Unfazeable merely provides the maximum bonus of +4. This modified willpower is then halved before applying any situational penalties. This is the final number to be checked under the standard GURPS Fright Check rules. Suffice it to say, failure is inevitable in most cases, leaving only the degree of failure to be determined.
[(IQ +/- Strong Will) + (Max +4 from Unfazeable or Fearlessness) /2 ] - Mythos Fright Check Penalty.
To find the Mythos Fright Check penalty in terms of Chaosium's system, simply take the maximum result for lost sanity and divide by two, rounding off. 1d100 SAN losses and Deities are a special case: Minor Great Old Ones such as Rhan-Tegoth and avatars of Y'golonac are worth -15. Major Great Old Ones and Minor Outer Gods such as Great Cthulhu or Yibb-Tstll are worth -20. Most Outer Gods such as YOG-SOTHOTH and most of the monstrous avatars of Nyarlathotep are worth -25. Only AZATHOTH is worth -30. This represents a slight departure from a straight conversion and GURPS CthulhuPunk.
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Mythos Creature
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Mythos Fright Check
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Deep One Hybrid
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-1
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Advanced Deep One Hybrid
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-2
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Deep Ones, Ghouls, Shan
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-3
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Mi-Go, Yithian
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-4
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Elder Thing, Flying Polyp
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-5
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Colour Out of Space
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-6
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Father Dagon and Mother Hydra
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-7
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Dark Young of Shub-Niggurath
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-8
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Star Spawn of Cthulhu
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-9
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Shoggoth
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-10
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