SDM Loot Overhaul is a tool for developers of mod builds that allows you to edit or create your own conditions.
You can also replace the drop of items by executing a command, spawn a creature, or give out another item.
Editing is done through SNBT files or through CraftTweaker.
The mod has many conditions and logical operations. Starting from the usual ones such as getting an achievement, ending with the number of creeper explosions in the world.
The mod has its own wiki for familiarization with its functionality.
The mod supports CraftTweaker, but to get usage information you will have to look in the source code.
