Challengers of Olympus
Wild Card: Mythos: This skill cannot be bought at character creation nor can it be raised with XP. It must be earned in game and represents a character’s knowledge of the Cthulhu Mythos. It is also the skill used when casting magic. For every 2 ranks a character has in Mythos, his sanity is permanently reduced by 1. Any sanity checks the character makes take a penalty based on their ranks in Mythos.
1: No Penalty
Wild Card: Psychotherapy: This is the skill required to restore any sanity lost by characters during their adventures. It is highly recommended that at least one character take ranks in this skill.
Occultism: This skill represents knowledge of any non-Mythos creatures, books, etc. For anything related to Mythos characters must have ranks in Wild Card: Mythos.