Crystal Creatures

The mod adds 4 new mobs, new items and blocks.

The Crystal Creeper: Faster than your average creeper and produces a chime sound for every step it takes. Successfully striking down this mob it will drop an emerald. 

The Sapphider: A spider made of sapphire that can move incredibly quickly. The Sapphider can be ridden by the player and although it seems hostile, the Sapphider cannot produce any damage to other entities. Killing this mob will make it drop Sapphire String, this can be used for making Sapphire Sand in which can be smelted into Sapphire Glass. 

Sapphire Glass allows for quicker movement of entities standing on top of the block. 

The Amefish: A silverfish variant made of amethyst that is hostile to monster creatures and is neutral to the player. The Amefish fires amethyst crystals at its enemies, this mob can be led using a lead. 

If by chance a Amefish kills a Crystal Creeper, the Crystal Creeper will drop an item called a Heart Gem. This gem can be used instantly heal the player. 

Diamond Steve: This mob is very powerful and wields two diamond swords, the mob is projectile proof and does not die in lava. This mob will produce a diamond upon death. Villagers killed by Diamond Steve have a chance to become zombified.