Classes

All official classes are allowed, the only banned official subclass is Peace domain cleric. You will also have access to my own paladin subclass, the Soul-Bound.
Draconic Bloodline sorcerer, Drakewarden ranger, and Circle of the Wyrm druid are all allowed, but will need to be reflavored as dragons don't exist. I also recommend reading through the list of deities before deciding if you want to play a cleric because there are very intentionally some types of gods that just don't exist, so you'd have to consider how a nature cleric exists without a nature deity.
I am also open to allowing classes and certain subclasses from Valda's Spire of Secrets on a case-by-case basis. I'm only tentatively allowing the Path of Heavy Metal barbarian, GM warlock, Future You warlock, Toon Magic sorcerer, Oozemaster sorcerer, Xenoalchemist, Ooze Rancher alchemist, Arachnoid Stalker rogue, and Mechanaut's Guild craftsman. If you're really in love with the mechanics of one of those subclasses and willing to put in the work to reflavor them to fit the setting/be less gimmicky, I might consider it. Path of the Colossus can only be taken by PCs who are at least medium sized.