The shadow fight multiverse in the Underworld continuity is 2-B (
with kali mentioning innumerable planes and
titan conquering those worlds, universes in this context), however, with the introduction of characters like Architect and Puppeteer in the underworld special events, the verse can reach low 1-C.
Architect originates from the "Real World" which exists above the cosmology of Shadow Fight 2, where Shadow Fight 2 is a
work of fiction and Architect is the Author, from where
Architect can essentially delete the game if he wishes so. Enough to place him and the "Real world" at low 1-C. In the event, we see him
invading the world of Shadow Fight 2 by breaking the fourth wall, creating a
pathway from his soundstage to the world of sf2 through which he is able to walk into Shadow Fight 2 and interact with his creation (the main characters), where he is ultimately defeated by shadow when he states that he has grown bored with his creation and plans on
rewriting the entirety of sf2 if
shadow fails to surprise him, after which architect wonders
if shadow no longer belongs to his creator and has taken
a life of his own. Soon after, he
makes Shadow talk with his powers before leaving, showing us that he didn't necessarily get weaker as he entered through the broken 4th wall. Architect still has his
"Author-like" powers while he's still in-game, as there's no avatar creation, he walks straight into
the game from his soundstage (real world)
Argument:
Architect got weaker when he entered sf2 via dimensional manipulation.
Counter argument: The
notifications in which architect threatens the player with the deletion of the game were sent while the event was on-going (while architect was in game), two things can be observed; Architect can still directly challenge and threaten the player, and potentially delete the game altogether if he just wishes so.
Some additional info - Architect was able to
force words into puppeteer's mouth (
Architect's inner monologue).
Now, it could mean that Shadow temporarily gets to low 1-C via
Reality Equalisation, due to the nature of where the fight
takes place, where the fourth wall (barrier between the "real world" and the fictional world of sf2) is broken. As RE is closely related to
R>F T.
Conclusion:
Architect -
Low 1-C
Shadow -
Low 2-C (defeated Tenebris),
Low 1-C with
Reality Equalization (Can trade blows with Architect)
Tenebris and other Underworld characters -
Low 2-C
Tenebris 2-B Upgrade.