I am writing a mod that needs to change what Emeralds drop. The easiest way I have found to do this is to remove the spawn, then write my own block which drops what I need it to drop.  I have managed to extend the Extreme Hills biome class and add in the new Emerald for spawn, but it stills spawns the old Emerald in too. I don't want to have to edit the minecraft jar, but I can't think of anything else to try.  Is there a forge hook I'm missing to cancel emerald spawn? Or maybe reduce its spawn frequency to 0?  Any help would be more than welcome!

Subscribe to OreGenEvent.GenerateMinable.

Keep in mind that it's posted on the MinecraftForge.ORE_GEN_BUS instead of the default EventBus.

 

I subscribed to this one in order to deny diamond gen, but I didn't see any hook for emeralds.  Is there one in a newer release? Or is there an EventBus that denies biomes so I can override the Extreme Hills entirely?

Exactly what I was looking for! I expected it to be dirty, seeing as Forge doesn't really have a hook for it yet.  But its better than trying to override the entire biome! Thank you!