Hi, I don't know if this is even a feature hence why I'm asking here. I'm trying to increase spawns from a certain mod on a certain biome using spawner.json, but turns out the "mod" condition only works for spawn.json. The mod i'm using has A LOT of mobs, dozens, so I really would prefer to have an easy way to increase spawning of all of them rather than having to list all their IDs one by one. Is there a way to do this?

Nope, in spawner.json you have to be specific. There is no other way