Melgren only makes a physical appearance in Chapter 3 ofOnyx Storm.

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

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

Onyx Storm And Fourth Wing With Hearts In The Background

Fourth Wing and Onyx Storm book covers

Custom image by Yailin Chacon

Onyx Storm with dragons on the sprayed edges and a green dragon background with blood dripping

Custom Image by Yeider Chacon

Onyx Storm by Rebecca Yarros and a background featuring a castle and a yellow and red tint

Custom Image by Yailin Chacon

Onyx Storm Book Cover

Violet Sorrengail faces new political intrigue and battles old enemies while uncovering the secrets of her second signet. As she strives to save Xaden from venin corruption, her relationships with allies and dragons are tested, leading to intense confrontations and unexpected revelations in a world of dragons and magic​.

Onyx Storm