Surprising Loot

Surprising Loot can let you create datapacks to define unexpected encounters to adventurers!
When a player first opens a container tied to a specific loot table, there is a configurable chance to spawn entities nearby, making treasure hunts far more thrilling or insteresting.
Supports both vanilla and modded loot chests, and is compatible with Lootr.

An example datapack is included in
data/surprisingloot/loot_events/example.json:

{
  "loot_table": "minecraft:chests/jungle_temple",
  "check_range": 3,
  "chance": 1,
  "spawn_times": 3,
  "entity_pool": [
    {
      "weight": 2,
      "entity_type": "minecraft:zombie",
      "nbt": "{CustomName:'\"Gift\"',CustomNameVisible:1b,Health:2.0f,Attributes:[{Name:\"generic.max_health\",Base:50.0}]}"
    },
    {
      "weight": 1,
      "glowing": true,
      "entity_type": "minecraft:bat"
    }
  ]
}

Datapack Field Explanation:

• loot_table — The loot table ID this event applies to.
• check_range — Search radius for valid spawn positions (in blocks).
• chance — Chance for each spawn attempt to actually spawn a mob (0.0 ~ 1.0).
• spawn_times — Number of spawn attempts to make when the event is triggered.
• entity_pool — List of possible entities to spawn, with weighted selection.
  
  • weight — Higher values increase the probability of this entry being chosen.
  • entity_type — Entity ID to spawn.
  • nbt (optional) — NBT data string to customize the entity.
  • glowing (optional) — If true, the entity will spawn with the glowing effect.