Diamondhead

Diamondhead is a Petrosapien (Petro- referring to rocks, sapien referring to an intelligent being; Petrosapien would mean intelligent rock) from the planet Petropia (a combination of the Greek Petro- and topos, forming a word similar to rock place). Ben first transforms into Diamondhead in "And Then There Were 10" when he needed to fight Vilgax's giant robot.

Abilities
Made from an extremely durable crystal, Diamondhead is nearly invulnerable, and a massive amount of force is needed to cause it noticeable harm. Additionally, its sharp crystal body discourages physical contact, as crystal spikes can be grown from any point of contact and retracted just as quickly. Diamondhead can also alter its own physiology, allowing it to regenerate its body after any damage occurs to it if necessary. Light-based weapons are also useless against Diamondhead, as Diamondhead can use its body as a mirror, reflecting light and beam-based weaponary and using them to its own advantage instead.

Offensively, Diamondhead can fashion crude weapons from its body, and can even fire crystal shards as projectiles. It can grow crystals on other objects as well. Diamondhead is also far stronger than a normal human, which, when combined with its self-fashioned weapons allow him to slice through objects with ease he can fire ice from his palm.

Weaknesses
The one drawback to Diamondhead's crystal form is that it can shatter if exposed to sufficiently strong sonic vibrations or if smashed brutally with any blasts. While Petrosapiens can regenerate limbs, there is a limit to how much damage they can recover from in a short specific while. Another weakness of Diamondhead is fire by melting the diamond. Strong sonic bursts usually do him in. This is shown in Ben 10 vs. The Negative 10 Part 1 against Rojo's weaponry, and in Ken 10, when Diamondhead is facing off against Ken 10 000, he gets hit with Benwolf's sonic howl.

Planet
Petropia is a crystal-covered world, and its inhabitants are silicon-based lifeforms. The majority of its inhabitants live in underground kingdoms. The planet was destroyed by Vilgax with some assistance from a Petrosapien named Tetrax, who unknowingly helped Vilgax destroy his home planet.