What is the fourth occult science, Qiyas?
Qiyas is a "fourth" occult science introduced in the third edition supplement Al-Mugawir . I put "fourth" in quotes because that appellation doesn't count the Selenim's occult sciences or other so-called "fourth sciences" practiced by the Exiles. So far it hasn't been officially converted to fifth edition, along with 99% of the content from past editions that aren't the rules for the three Nephilim occult sciences, so I can only refer to third edition for details. Qiyas relies on the practitioner's or Qiyasim 's Solar-Ka, so it may only be practiced by those who have awakened and integrated their Solar-Ka. This includes Ar-KaIm and initiated humans by default, but Nephilim and Selenim need to jump through further hoops before they can learn and practice it. This is done by becoming an Apprentice in any Quest that awakens one's Solar-Ka or being part of a splat that does so at character creation. Qiyas operates similarly to Sorce...