EthanWall

import crafttweaker.api.loot.condition.LootTableIdLootCondition;
import crafttweaker.api.loot.modifier.CommonLootModifiers;
import crafttweaker.api.loot.condition.LootConditions;

// Aether
loot.modifiers.register(
    "aether_egg_dungeon_chest",
    LootConditions.only(LootTableIdLootCondition.create("minecraft:chests/simple_dungeon")), 
    CommonLootModifiers.addWithChance(<item:dragonmounts:dragon_egg>.withTag({ItemName: "dragon_breed.dragonmounts.aether", BlockEntityTag: {HatchTime: 12000, Breed: "dragonmounts:aether"}}) % 20)
);