Harmony - Troop Symmetry

Here's another question:
Seraphs are currently an upgrade to Angels, an alternative to Archangels, but according to the lore of Ashan, this shouldn't be the case – an Archangel can be an upgraded Angel, but a Seraph cannot, as it is not an Angel and is nothing more than the result of the union of human and angelic souls. Hence, there is a need to rename it.
Solution:
First option: the alternative upgrade will not be a Seraph;
Second option: we do as in Heroes 7: Seraph replaces Angel, Celestial Warrior replaces Archangel, and someone else replaces the alternative upgrade

Descriptions (taken from here https://mmh7.ubi.com/ru/factions/haven/creatures/seraph/upgraded)

1) SERAPH
Angels of Light are perfect beings. They are taller and stronger than any human; their noble faces are striking in their beauty; they radiate power and confidence. Seraphs are not as majestic as Angels; they are more like humans, but their presence also inspires hope and determination in soldiers.

KASPAR'S COMMENTS
"During the Second Eclipse, in a desperate attempt to replenish the ranks of Angels, whose time seemed to be coming to an end, the idea arose to unite the souls of humans and Angels. This is how Seraphs came about... When the secret of their origin was revealed, unrest began throughout the Empire. But Empress Gwendolyn of the Falcon lineage resolved this conflict by decreeing that Seraphs serve the Crown, not the Council of Angels."

2) CELESTIAL WARRIORS
Celestial Warriors are the best fighters among the Seraphs. They bear the names of Angels who fell during the Ancient Wars... These are experienced, fearless fighters, possessing boundless courage. Thanks to the power of Light, they can heal allies and resurrect fallen soldiers.

KASPAR'S COMMENTS
"Initially, the human nature in a Seraph is stronger than the angelic one. It takes many years for a Seraph to realize its purpose and become a Celestial Warrior."

Suggest options:)