Tier List (Updating Over Time)
Lore-based power levels.
I made this according to my own assumptions based on the lore. Though I might be wrong.
Give me your own thoughts with concrete evidence.
Power levels are divided into 8 tiers. And each tier has 3 sub-tiers (Low, Mid, Peak)
SSS: Celestia (Peak), Nibelung, Dragon Sovereigns
SS: Archons (Prime), Dvalin (Prime), Orobashi (Prime), Azhdaha (Prime), Andrius (Prime), Chi, Osial (Prime), Golden Wolflord
S: Zhongli, Venti, Ei, Nahida, Harbingers 1-3rd seats, Osial (Weakened), Azhdaha (Weakened), Kapatcir, Magatsu Mitake Narukami no Mikoto, Shouki no Kami, Dvalin (Weakened), Alice, Rhinedottir, Neuvillette
A: Adepti, Harbingers 4-8th seats, Andrius (Spirit), Osial's wife, Iniquitous Baptist, Yae Miko, Xiao, Shenhe, Beidou, Albedo, Clorinde, Dainsleif
B: Harbingers 9-11th seats, Abyss Herald, Abyss Lector, Oceanid, Maguu Kenki, Aeonblight Drake, Mechanical Array, Matrix, Ruin Serpent, Primo Geovishap, Setekh Wenut, Jadeplume Terrorshroom, Rifthound, Bathysmal Vishap Herd, Elite Eremite, Regisvine, Cyno, Dehya, Ayato, Kujou Sara, Lisa, Eula, Diluc, Kaeya, Rosaria, Klee, Candace, Alhaitam, Ningguang, Yelan, Ayaka, Ganyu, Qiqi (Berserk), Kazuha, Wriothesley, Navia
C: Consecrated Beasts, Hypostasis, Lawachurl, Hilichurl Rogue, Automaton, Kairagi, Shadowy Husk, Black Serpent Knight, Hu Tao, Fischl, Jean, Noelle, Keqing, Razor, Itto, Mona, Xingqiu, Baizhu, Gorou, Kuki Shinobu, Sayu, Heizou, Faruzan, Kaveh, Tighnari, Lyney,
D: Abyss Mage, Specter, Fatui Skirmisher/Agent/Mage/Mirror Maiden, Elite Fungi (Shroom), Whopper Flower, Mitachurl, Amber, Bennet, Sucrose, Mika, Chongyun, Xiangling, Yun Jin, Thoma, Kirara, Yoimiya, Kokomi, Collei, Layla, Qiqi, Furina, Charlotte, Lynette, Freminet
E: Slime, Hilichurl, Samachurl, Fungus, Barbara, Diona, Xingyan, Yaoyao, Dori, Nilou
Weekly Power Status
-- Power
Ranking 
-- Power
stone