In most cases there is no “vetting” or “playtesting” needed for creatures, b/c 5 different GMs can run the exact same creature 10 different ways.
The creatures that are made should all have a level listed for them, and this is the biggest indication for balancing an encounter.
The other big thing about an encounter I went into a little detail in this post:
But not included is considering Action Economy. How many Actions (Major, Move, Minor) the party has vs the NPCs/Creatures.
A wiki is almost done, working on finalizing it now actually as I type this here. The main goal is having a place for Items (mundane and extraordinary) as well as NPCs/Creatures/Playable Characters.
So that will be a bestiary that can be referenced for sure. Right now mainly you’ll have to look at what is on this site. I’m hoping to be done with the wiki so people can start using it by Friday. Mainly working on the backend stuff for it, and guidelines so that pages will be alike and easier to reference, etc.
I’ll post here when it is done:
Meanwhile, it is easy to convert any creatures from say D&D, and if you want help, just post it here in the community site, or over on Discord. People tend to be able to do these things pretty quick (on average, once you are used to it, easily building creatures/NPC in 30 ~60 seconds for a particular encounter)