The page says nothing about that distinction regarding Concept Manip, though.
What causality is concerned... any evidence of that? I don't see why Karma or Life and Death would qualify as causality, nor why fate would. (I mean, SH causality manip isn't just "your destined to xy", it's just straight up reality warping to make whatever they want happen immediately) Medea's attacks aren't just Death Manip based casuality, they straight up destroy causality in and of itself as a neat little side effect.
Also, and that's relevant as well, is resistance immunity here? At this level in particular? Because if this stuff does any damage at all, Medea can just pile it on even if it doesn't oneshot.
That is because the implication is that since the third step section mentions CM1 to the degree of essence, the CM1 being excluded is that of Essence level concept manip, in addition to domains previously having been type 2(old type 3) and ecang still only mentioning not having CM1.
I would have to search through 2000 chapter long novel for scans, give me a break if you will, but I can just give a summary of what it is, and it isn't just making someone destined to do smth. Life and Death is that life is the cause and death is the effect, when a raindrop is born in the sky that is the cause and it falling to the ground is the effect, the raindrop landing on the ground is the cause and it forming a puddle is the effect. Wang Lin uses Life and Death normally to well, manipulate life and death in conventional manners, but he has down the capabilities to bring stuff like spells to their end, removing the effect of them happening. For Karma it is easier as Karma fundamentally involves manipulating Karmatic Cause, Karmatic Effect, and Karmatic Fate, for uses I currently do not exactly remember, but it isn't as simple as manipulating destiny or whatever. And fate just encompasses causality in Ergen.
Yes, yes it is, given wang lin wasn't even second step when he had his life and death domain, and was not that far into second step when he completed his karma one, and the difference between even peak 2nd step and entrance 3rd step is greater than the difference between peak 2nd step and mortals.
Which is still not really impressive for Medea, who scales to her own durability to an extent, which can take countless blows from Rapthalia, who has AP comparable to Medea's casual attacks, which are stronger than what she does by merely existing, which destroys a universe reinforced by fusing 8 universes together.
I mean Ecang itself does just scale above the whole entry-level 3rd step cultivators being able to laugh away quasi 3rd steps, given he scales to the golden exalt level, of which there is, many a gap between since each stage has 4 parts, early, mid, late, great circle/peak, the difference between them at this level being to such a point that one above can stomp the one below them, and only gets larger as one rises up the stages, and Ecang scales to the 5th stage
Meaning he is
Quasi 3rd step (Low 2-C with a thought) << Early Nirvana Void (Can Laugh away Quasi Third Steps) < Mid Nirvana Void < Late Nirvana Void < Great Circle Nirvana Void << Early Spirit Void < Mid Spirit Void < Late Spirit Void < Great Circle Spirit Void <<< Early Arcane Void < Mid Arcane Void < Late Arcane Void < Great Circle Arcane Void < Arcane Tribulants (Still apart of the arcane void level with there being 9 steps each stronger than the last) <<< Early Void Tribulant <<< Mid Void Tributlant <<< Late Void Tribulant <<< Peak of Late Void Tribulant (Ecang's level)
Except in this case the fusing of two universes explicitly makes the resulting universe more durable, so each fusion is an above baseline by the same logic that casually destroying a universe or oneshotting someone baseline is.
It would be unquantifiably greater yes
No. No she doesn't do so via draining. Her AP section literally says nothing about draining so I don't know where you get that from.
Your entire feats section literally says she mostly passively destroys the universe by draining it, yes she can actively destroy it, but that is far different than being able to destroy it passively