Thoughout Revelation, it is said that “they [the saints] will reign.”
Blessed and holy is the one who takes part in the first resurrection.
The second death has no power over them, but they will be priests of
God and of Christ, and they will reign with him for a thousand years.
(Revelation 20:6 NET)
Who and/or what will they reign over? Reigning without subjects seems non-sensical.