UAVwaffle's Mob Crystals is a mod that adds a crystal to store and transport mobs!
Textures by Flint Mischiff
Just right-click or shift-right-click any* mob to store it in the crystal. Time does not flow for mobs sealed in the crystal, so no need to worry about them getting lonely!
Recipe:
Spoiler
*You can configure the mod to use a whitelist or a blacklist for what mobs can be sealed. The config also has options for max mob hp (default 50) and max stack size (default 16). Also, note that some mobs cannot be sealed in a crystal due to how Minecraft handles right-clicking. Dogs and Horses are among those. If there is enough demand, I will consider fixing this. (p.s. works with villagers if you shift-right-click)
