Sondu

Sondu was an Elemental from the prehistoric era, who betrayed the others to live on earth.

Prehistoric Era
Sondu was one of the last survivors of her kind when Katmos destroyed the Clay Elementals. She was then taken with him in his pod.

Modern Era
Sondu awakened with the others in the modern era. She was left with the now mind-controlled Flash, to kill Sana, but was captured.

Sondu then worked with the pair to track The Green Lantern, and helped kill fellow Elemental Corito.

When Katmos tried to flee, Sondu was the one who lead the heroes to the pod. Sondu and Sana then defeated the Elemental Kierza.

Reed Richards provide Sondu with the name "Sondra Fuller" and a new identity so she could assimilate with humanity.

Powers and Abilities
Clay Skin - Due to her physiology Sondu has all the traits of clay.
 * Shapeshifting - Sondu learnt to use her clay form to shapeshift and take on the appearance of humans.

Weaknesses
Heat - Due to being made of clay, when exposed to heat her form begins to stick.