System is Pathfinder 1e. Starting level: 10. Races allowed: All Core, Featured, Uncommon, others on a case by case basis; dhampir, android, and others that have atypical relationships with positive energy are dicey to banned. Classes: Arcanist banned, Summoner uses Unchained, gunslinger uses Bolt Ace.

Character creation uses a 25 point buy, HP take average-rounded-up per die (so d8 is 5 HP) per level. Leadership is banned. Sacred Geometry is banned. Fate's Favored is banned. Two traits, three and a Drawback, your pick. Background skills are yes.

All characters should be in Osirion or neighboring countries and start the game with a corruption that will be decided by GM and player in discussion. The way these corruption tracks work is basically that there are three categories for each person: physical, mental, and behavioral. Each track proceeds from Stage I (which is a strict minor benefit) to Stage II (minor benefit, minor drawback), Stage III (moderate benefit, moderate drawback) and finally Stage IV (moderate benefit, severe drawback). You can pick whether you want your first manifestation to be physical, mental, or behavioral in nature. After that, whenever you advance further during the game, it'll be randomly determined which category will advance a stage (starting at 0 for the categories you didn't choose to start). Once something is at Stage IV, it isn't an option to advance further. If all three hit Stage IV, your character dies/transforms beyond recognition and is no longer playable, at your preference.