However, it’s later revealed thatTheophanie wields storms like Violet’s mother, General Sorrengail, not lightning.

However,Theophanie’s storm-wielding ability is not the only signet thought to be in her arsenal.

When Yarros first introduces her character in the dungeons of Basgiath, Violet sees her abruptly disappear.

Onyx Storm by Rebecca Yarros book cover

Yarros has yet to confirm this, and now that her character is deceased, we may never know.

Fire erupts, barreling toward us in a deadly stream."

Initially, this is thought to sit within their abilities to cause mass destruction.

Fourth Wing and Onyx Storm book covers

The cover of Onyx Storm by Rebecca Yarros with the cover of Fourth Wing as the background

Every-Venin-Signet-Power-In-The-Fourth-Wing-Books-After-Onyx-Storm-(Confirmed-&-Theories)

Custom Image by Yeider Chacon

The cover of Onyx Storm by Rebecca Yarros with many covers lined up as the background and fire surrounding it

Custom Image by Ana Nieves

Onyx Storm posed to the side and a colorful background that looks reflective

Custom Image by Yailin Chacon

Fourth Wing and Onyx Storm book covers with flames and dragons background

Custom image by Yailin Chacon

The cover of Onyx Storm by Rebecca Yarros with a background featuring blue dragons on a rock and a pink sky

Custom Image by Yeider Chacon

Onyx Storm Book Cover

Onyx Storm