Kali
A reptilian shapeshifting agent of Nazmul who was assigned to find her master a new body. Kali saw Kara as a suitable host for Nazmul because of her great potential. She posed as a fallen Defender, Rayald, who was traveling with them to the Nexus. Putting a band on Kara's arm, it allowed Kali to enter the Nexus without being rejected. Then she changed into Dod the "Nexus Keeper". In this form, she tricked Seth, Melosa and Erik into thinking that the sigil energies that sustained the Nexus were out of order. However, Namoor, the true keeper of the Nexus, discovered the plot and smashed the armband, banishing Kali from the Nexus. She later worked for her people, the Mortigarians, who wanted the Tome of Al-Mortigar and the Celestial Abyss. She posed as Kara to infiltrate the Defenders but Seth sees through her disguise when he noticed in an ultimate mirror that she had no reflection. She managed to escape with the Orb of Ogama-Yan and the key to the Tome but was mortally wounded by Si'i. Seth tried to save her but there was nothing he could do. As an act of kindness, she tells him where Kara was before perishing.
Kali apparently used a guardian named Vanathos.
Read more about this topic: List Of Di-Gata Defenders Characters, Secondary Characters, Enemies To The Defenders