This fall will see longtime “Thor” writer Jason Aaron end his run on the series, and with the end of an era also comes a newly announced four-issue mini-series from Aaron and Esad Ribic entitled “King Thor.”

The book will see the ancient one-eyed God of Thunder battle his brother, Loki, for the final time. Only this time, Loki wields the Necrosword – a powerful weapon that is lethal even to the immortal gods. Judging by Ribic’s cover for the first issue, Thor will fight alongside his granddaughters, Frigg, Atli, and Ellisiv.

Aaron first began his run on the character with Ribic in 2012 with the ‘God Butcher’ arc. Ribic stayed on the book for the first year of the run, through the ‘God Bomb’ arc. The King Thor character has appeared several times throughout Aaron’s seven-year long run, first appearing in the ‘God Butcher’ arc to help his younger counterparts defeat Gorr the God Butcher, the original wielder of the Necrosword.

Loki will also be appearing in a different one-shot this September. “Avengers: Loki Unleashed!” will be written and illustrated by veteran “Avengers” collaborators, Roger Stern and Ron Lim, and takes place directly after the events in ‘Avengers: Under Siege’ (“Avengers” #270-277). You can read more about that here.

“King Thor” #1 is currently slated for release this September.