Zarchnid

Zarchnid was an evil servant of Carnus and Masidai, who had betrayed his own race to get power.

Biography
Zarchnid betrayed his own species for Carnus, causing the deaths of many of his race, including the family of Zrone. Zrone and Zarchnid were mortal enemies.

When Zarchnid became a servant of Carnus, he was enhanced and became stronger. Originally a wasp like creature, Zarchnid became a large robotic spider.

The Return of Carnus Arc
Zarchnid was going to eat Knox, Kuro, Lilith, Nacule, and Hikari Minato, whenever they were trapped in his spider web, but Zrone showed up and saved them. Zrone had an intense battle with Zarchnid, and eventually killed him.