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remove the parameters from the Mod.EventBusSubscriber annotation and this code line: MinecraftForge.EVENT_BUS.post(event);

you need to render the lines of the box, look at the StructureBlockTileEntityRenderer for an example but basically you render a box with WorldRenderer#renderLineBox

Solved: Thank you for your patient help. It works now and believe me, the satisfaction of having a diamond pop out of a grass block after hours of making stupid mistakes is way greater than the satisfaction of just finding a Diamond in survival . This is the final class for registry: package com.FenrisFox86.fenriscore.common.events; import ... @Mod.EventBusSubscriber(modid = FenrisCore.MOD_ID, bus = Mod.EventBusSubscriber.Bus.MOD) public class LootModifierEvents { @SubscribeEvent public static void registerModifierSerializers(@Nonnull final RegistryEvent.Register<GlobalLootModifierSerializer<?>> event) { System.out.println("registered"); event.getRegistry().register(new CrusherModifier.Serializer().setRegistryName( new ResourceLocation(FenrisCore.MOD_ID,"crush_drop"))); } }

You don't run mods. You put them in the mods folder.