The Vexicons

The Vexicons are four female warriors of immense strength and abilities who make their official debut in Episode 30. They are called forth from Proxima's more powerful Dark Codex, who refers to them her "children."

They covet an ancient, lost scepter that had belonged to King Lorius the Glorious, which possessed the power of mind control. They race against the Mysticons to retrieve it from a hard-to-reach location somewhere in the farthest parts of the realm.

They also an animal sidekick, a blue ferret that Mallory wears like a muffler. He is called Deeva.

Their names are:
 * Mallory, a staff-wielder with ice powers who is the dark counterpart of Arkayna. Her phrase is "Ice Serpent, Strike!" from her deep blue Serpent/Snake Bracer.
 * Kasha, an orange cat-girl on roller blades who opposes Zarya. Her battle phrase is "Shadow Panther, Pounce!"
 * Eartha, a large stone giant who is the evil counterpart of Em. Her phrase is "Basilisk Stampede!" from her pink Basilisk Bracer.
 * Willa, a tiny winged girl who is the dark counterpart of Piper. Her battle phrase is "Feel the Nightmare!" from her purple Bat Bracer.

Mallory
Possessing very strong cryokinetic and frigiokinetic powers, she can emit strong beams of solid ice from her hands and dark magical staff. She holds the dark power of the Serpent. She can encase her opponents in a solid block of ice, and erect an ice shield that can defect Arkayna's fiery beams with ease.

Kasha
Has razor-sharp claws that can slice through anything and can move at high speeds via energy skates. She also, naturally, has feline reflexes, endurance and flexibility. She wields the dark power of the Panther.

Eartha
Her body of hard rock enables her to turn into a large boulder that can defect energy-based attacks. She holds the dark power of the Basilisk. When the maleficent eclipse temporarily boosted her abilities, it bestowed upon her a hammer from which she could fire a strong energy burst. She can regenerate her rock solid body if need to.

Willa
She is able to emit a unusually powerful blast of pure dark energy from her hands, and has winged flight via her pixie wings. She holds the dark power of the Bat. She can also teleport herself and her fellow Vexicons over short distances. Her strongest dark energy blast is what she calls her "Boom Doom" attack.

Trivia

 * They are considered to be darker versions of the Mysticons: "Anti-Mysticons" by fans.
 * They are the only beings to have resided within a magical book, to be called upon into the real world.
 * They each have their very own animal Bracers: Serpent, Basilisk, Panther, and Bat.
 * The reason why their weapons and special abilities are a whole lot stronger and more effective than those utilized by the Mysticons is due to the Dark Codex from which they came is filled with immensely powerful dark magic; whereas the one that strengthens and powers up the Mysticons had been drained dry of its magic.