These are not Type Moon mages.
These people are not limited by fancy schmancy concepts like "mana points/prana" or "balance".
These are eldritch abominations whose gibbering madness alters reality itself.
They are Space Marine Psykers, and Tzeentch isn't there to stop them. They're Doc Savage with lightning fists, the bastard children of Son Goku and Professor X, shamans who warp time and space and dimensions and god knows what in the realms beyond all man was believed to comprehend.
The only thing that truly weakens mages, their kryptonite, is other eldritch abominations whose gibbering madness alters reality itself the ones who don't know they can do that.
Gilgamesh? Fuck him, his city was 3 square miles/6 square kilometers wide and he killed 2 people in his entire epic. Mages rule entire continents and they've killed billions by randomly getting pissy.
.... This is me exaggerating, but you get the point; Indrajit is broken. Just not THAT broken, because other mages are also broken.