Thinking about it with all things in consideration, i seriously believe Aglaecwif may be more dangerous than Indra, and the one to either put one of the big three down or at least make him bleed, badly.
Obviously Indra would be the superior on raw strength n' power, i can't see Glae throwing H-bomb worth punches like he does for instance, but on everything else, including the versatility and potential of their trait?, that's other deal, initially i think that the Fantasy trait was lame, focused only on genjutsu type stuff(that was a pretty moronic take tbh), but delving into it more, leave it clear that is so much more, on the first place pure mental fuckery is the domain of Fourth, Fantasy for what Glae has shown on the other hand, is more mystical stuff on top mind-violation, said trait is after all twin of truth that have a direct effect on reality(And even if we discard the theory of Henri being Paradox, hence his reality warping, we know twin traits often share qualities), Glae was able to take the Eye of her son than the MC purchased, ignoring distance, the brothel's fantasy scenario had seemingly a effect deeper than a simple illusion, not to mention how Glae's lair was described as a den of dark forces, with her offspring being formless and omnipresent on it able to see from different points at once, and all of that is just her trait, she apparently has mastery over dark magic on the side.
Besides, we can't forget how calm she was when facing Malik(granted he was going easy as well, but that put things at common ground at least), and for all we know he might be within a false world created by her as of right now.