The Rings of Power has introduced a proto-wraith who may become the next Witch-King.
Theo, the son of Bronwyn, is revealed as one of Sauron's Nazgnagol and allegedly kills the elf Arondir in a shocking twist.
The narrative hints that Theo's lineage of sorcerers and kings, combined with his dark transformation, could lead him to become the feared Witch-King, possibly riding a Fell Beast.