This Minecraft mod is called TerraArts and introduces various accessories and artifacts from the popular game Terraria. You gain access to a special inventory for storing artifacts, which can be opened by pressing the L key.
However, obtaining these valuable items is not so simple – you'll need to explore the world in search of special treasure chests. These chests generate only in caves or on the surface, but never deep in rocks or in the air. All artifacts have a five-tier rarity system, and the chests are protected by locks of different colors that match the rarity of their contents.
To open the chests, you'll need keys, which can either be found in other chests or crafted (only the iron key). If you can't immediately open a found chest, you can take it with you, and the items inside will be preserved.
Occasionally in villages, you can meet a new villager who sells a Tinker's Table. This item allows you to combine artifacts and create more powerful combinations using recipes from Terraria.
Among the available artifacts, you'll find various bonuses – from a 5% movement speed increase (Aglet) to complete fall damage negation (Lucky Horseshoe) or fire resistance (Obsidian Shield). Some artifacts grant flight abilities, others enhance attack or defense, while others aid in underwater exploration.