Crystal Centipede

Abilities
As its exoskeleton is made of Crystal, it will be very hard to injure it. The only way to damage it is by using a Crystal Sword or Crystal Arrows fired from a Crystal Bow. Halfway through the fight, it will curl up into a ball of crystal thorns and then roll towards the player. While in this state, it cannot be damaged by any means. Destroy any blocks weaker than iron when rolling.

Special: Crystallize

Its basic attack can also cause Poison and Slowness, and the effect rises with more consecutive attack (On first hit, the player gains Poison I and Slowness I. On second hit, the Slowness I become Slowness II and so on). When it reaches Slowness V, the affected player dies instantly, as he was turned into a Crystal Statue of himself.

Trivia
No one knows how this magnificent yet bizarre creature comes into being. Historians and scholars suggest that it might have been created by ancient wizards as weapon during The Celestial Wars.

Extra Planned Content
Crystallized Human

A block which spawns when a player was killed by the Crystal Centipede using it's basic attack ability Crystallize. It looks a 2-blocks high Crystal Block with the player frozen inside it. Remains there until broken or mined. This can be found rarely in the Crystal Centipede Boss Chamber but with a random YouTuber skin in it. If the player does not have keep inventory on, all his item will be in his Crystallized body. When mined, the items will drop. The Crystallized Human block does not drop itself when mined unless you use a Silk Touch tool. While in your Inventory, a tooltip will specify who's body is in the block.