Crystal Gacha

The gacha mob is modeled on the creature from Ark: Survival Evolved and is fed by shift-clicking with an item in the main hand. Once it has eaten enough, a right click makes it drop a crystal, and the crystal rolls a random item of a matching rarity. Crystals come in common, uncommon, rare and epic tiers, and feeding the mob better items gives a higher chance of a better crystal.

Server owners can blacklist items so they never appear as gacha crystal drops; the default list includes items such as bedrock and command blocks. A separate option controls whether spawn eggs can be dropped. The mod was originally made in MCreator. Geckolib is required, and the mod runs on client and server, so the server and every player need it. Files are published for Forge and NeoForge, with builds for 1.20.1 and 1.21.1 under All rights reserved, and the source code is publicly available.