Fulmini

The Fulminis are a silicon-based species from the planet Fulmas.

Anatomy
Fulmini are made entirely of blue energy, and are reinforced by grey rock armor. They have a green moss-like pattern near the top of their bodies. While under the influence of their leader, the High Override, their bodies become lilac and their eyes become red.

Omnitrix Transformation
The Omnitrix's Fulmini representative is named Shock Rock, who first appeared in the reboot episode "The 11th Alien: Part 1". He was originally unlocked after Ben upgraded the Omnitrix using Upgrade in "Omni-Tricked: Part 4".

According to Duncan Rouleau, the Prime Timeline Ben Tennyson has Shock Rock available in his Omnitrix.