Introduction:

Inspired by similar features from Terraria, this mod adds various types of loot crates that can be found across the Overworld caves as well as the Nether. They are designed to promote exploration and reduce the appeal of strip-mining.

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Main features:

Break a crate to get 3-4 groups of items. Doing this for the first time grants a new advancement. In addition, most of the crates have a small chance to drop a unique item. There are four types of crates: Basic, Water, Biome and Special.

Crate type descriptions (including new items):

Basic crates spawn in caves of the Overworld and in the Nether. The common ones closer to the surface contain junk, torches and simple food while rare crates which can only be found deep underground can contain ores and even have a small chance to drop diamonds! Nether crates are worse than rare Overworld crates, but have a chance to drop Molten Pickaxe which sacrifices speed and efficiency for damage and the ability to set enemies on fire (can be repaired using Blazing Rods).

Water Crates have a chance to spawn in any body of water. This includes lakes, rivers and oceans. These crates may drop Anchor - a slow melee weapon with massive knockback which can be improved even further with enchantments (can be repaired using Iron Ingots).

Biome crates contain slightly more loot and replace common basic crates in challenging biomes. There are two kinds of them in the Overworld and one in the Nether:

Jungle Crates spawn in jungle biomes and may drop Blowpipe - a ranged weapon which uses various seeds as ammo (can be repaired using Bamboo).
Frozen Crates spawn in snowy biomes and may drop Frozen Staff - a ranged weapon which does not require ammo and launches snowballs (can be repaired using Ice). This weapon looses most of its power outside snowy biomes, but always deals increased damage to Blazes.
Ash Crates spawn in Basalt Deltas and Soul Sand Valleys. They may drop Flame Staff - a powerful ranged weapon which does not require ammo and launches fireballs (can be repaired using Blaze Powder). This weapon looses most of its power outside the Nether.

Special Crates come in two variations: Iron and Golden. Iron Crates have a really small chance to replace Water, Biome and common Basic ones. Golden Crates can similarly replace any other crate. They contain large amounts of valuable loot, a guaranteed enchanted vanilla weapon or book and a new item called Crate Finder (guaranteed in Golden Crates). It can be right-clicked to try to locate a crate inside a 33x33x33 cube centered on player. The item glows as long as the user remains close to newly found coordinates. There are three different sounds for locating a Special crate, locating any other crate and locating nothing.

All Surface crates can be obtained by fishing. Base chance of catching a crate is 5% and can be increased by 1% for each level of Luck of the Sea. Certain crates require fishing deeper underground or in specific biomes to be caught. Special crates also have a small chance to be caught regardless of location.

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Game rules and commands:

Spawn rate of crates can be changed through a new game rule in the 'Spawning' section. Alternatively, the following command may be used to edit the value in already generated worlds (replace default 75 with anything between 0-100):
"/gamerule lootCrateSpawnPercentage 75"

Base chance of catching a crate by fishing can be changed through a new game rule in the 'Drops' section. The bonus from Luck of the Sea scales with game rule's value: +1% at 5, +2% at 10, +3% at 15, etc. Alternatively, the following command may be used to edit the value in already generated worlds (replace default 5 with anything between 0-100):
"/gamerule lootCrateFishingPercentage 5"

The mod is created with the help of MCreator. Credit for some of the textures goes to anonymous users from Novaskin.

Underground Loot Crates