Plaguescarred
Hero
I could see players options in a GREYHAWK campaign settings book to contain things like;
New subraces such as Human Backlunish, Flanae, Oeridian, Olman, Rhennee, Suloise and Touv
New Snow and Valley Elf subrace
New Furchin Halfling subrace
New Thilronian Primal Path for Barbarian
New College of Olidammara for Bard
New Old Faith Druid Circle
New Zuoken Monastic Tradition for Monk
New Knight of Holy Shielding Sacred Oath for Paladin
New Gnarley Forest Ranger Archetype
New Suel Sorcerer origin
New Tharizdun Pact for Warlock
New Backgrounds such as Knight of Hart, Knight of the Watch, Scarlett Brotherhood, Prophet, Zealot,
Unique Dieties and new Domain such as Pestilence or Entropy
New languages such as Baklunish, Flan, Oeridian, Rhopan, Suloise and Touv
Gazeteer of the Flanaess
New monsters such as sons of Kyuss, Suel liches, froghemoths, vegepygmies, valley elves, grugach elves, spell weavers, animuses, sussuri, xvarts, norkers, varrangoins, losels, gingwatzim, manscorpions, Scarlett Brotherhood cultist, Greyhawk dragons, blood golems of Hextor, swordwraiths, grungs, qullans etc
New subraces such as Human Backlunish, Flanae, Oeridian, Olman, Rhennee, Suloise and Touv
New Snow and Valley Elf subrace
New Furchin Halfling subrace
New Thilronian Primal Path for Barbarian
New College of Olidammara for Bard
New Old Faith Druid Circle
New Zuoken Monastic Tradition for Monk
New Knight of Holy Shielding Sacred Oath for Paladin
New Gnarley Forest Ranger Archetype
New Suel Sorcerer origin
New Tharizdun Pact for Warlock
New Backgrounds such as Knight of Hart, Knight of the Watch, Scarlett Brotherhood, Prophet, Zealot,
Unique Dieties and new Domain such as Pestilence or Entropy
New languages such as Baklunish, Flan, Oeridian, Rhopan, Suloise and Touv
Gazeteer of the Flanaess
New monsters such as sons of Kyuss, Suel liches, froghemoths, vegepygmies, valley elves, grugach elves, spell weavers, animuses, sussuri, xvarts, norkers, varrangoins, losels, gingwatzim, manscorpions, Scarlett Brotherhood cultist, Greyhawk dragons, blood golems of Hextor, swordwraiths, grungs, qullans etc