3 new blocks/items

• Mob Shard: When killing a mob with this item in your off hand, it will slowly charge up until it is full.

• Ether: A liquid created via Superheating Soul Sand, is used to power the Custom Spawner.

• Custom Spawner: When filled with Ether and a fully charged Mob Shard is placed on top, it will start summoning mobs and consuming Ether. Works in a 5 x 5 range around the block.

Requires: Create

{
  "mob": "minecraft:pig",
  "max_charge": 20,
  "enabled": true
}