Many thanks for having shared your opinions, Witch-king. I will immediately address the points you raised, without losing myself in other types of explanations. I don't agree with most of your considerations, as, in my opinion, they lack some aspects that you didn't take into account or because you're considering just one side of the coin.
First of all, as you too recognised yourself, her greatest weakness at the moment are exactly heroes and monsters (I won't include elite units, since the feature is not mainly directed to them, and this fact alone already shows how this system is not broken at all). Against them, Galadriel is more or less harmless, unless one relies on defensive strategies that imply the intervention of other units; therefore, if we exclude the latter case, she is simply not capable of countering such typologies of units. Your initial statement seems thus to contradict the last consideration of yours, which you came up with at the end of the post.
Surely, Galadriel's main characterisation is exactly the one of a supporter, endowed with pervasive and wide-radius/long-range abilities. This is a paramount property of hers that
Ancient Might will in fact
not alter nor replace. This is something I always made sure to clarify, in case someone had been legitimately concerned about her role. When she enters this new and temporary form, her abilities will be turned into interfering powers and her nature will therefore mutate accordingly, albeit being bound by severe limitations. In regards of those boundaries, in no way is she to become anything close to a hero-killer: her long-range and supportive magic is transformed into long-range interfering magic, yet she also necessarily loses her supportive abilities for a given amount of time and her long-range attack (what also makes her so much useful from afar) is deactivated. Add to this her slowed-down movements. Of course, as you wrote yourself, the first two abilities are very useful against heroes and monsters, alongside increasing her chances to withstand that sort of assaults. But that's exactly the point of those abilities in the first place, while we forget for a moment about her supportive properties. There wouldn't be much point in conceiving abilities that don't match with a certain purpose
Regarding
Banishment into the Void, I don't find it broken at all. The comparison with the Witch-king is really flawed and incorrect, in my point of view. The ability you referred to (
Soul Disturbance) is available at level 7, and you should also consider that, once he uses that ability, the Witch-king is well free to strike heroes or units with other abilities and with his quite powerful attack (a wide space of manoeuvre and action). This is not the case of Galadriel, given the fact that all her normal powers will be reset, once returned to normality, that she can't count on
Eerie Aura anymore and that her normal supportive form will make it very unlikely to exterminate the heroes on whom she casts her confining spell. I probably forgot to mention that she eventually ends up being drained by her last ability; if I didn't insert this aspect, I apologise (I will edit the main presentation post). Furthermore, I don't think Sauron flees 'just' due to the shock wave of Galadriel's might; that's a too simplistic of an explanation: the Light captured in the phial (a remnant of the lost Two Trees of Valinor) is too much disruptive and repulsive for Sauron to bear its presence, as it happens for all foul creatures of any fashion that face the same fate. That's the point. Ok, if you don't like the idea of major heroes fleeing for being terrified as simple peasants, you may always view things this way: the Light of the phial repulses all enemies for a while, because of its holy nature.
Recreating a
de facto replica of
Word of Power would simply be very cheap and naïve. Uniqueness would be completely lost and that would certainly be a very broken proposal; something which would turn her in a mass-slayer, combined with the interfering effects of the first two powers. A total abomination
Nevertheless, if we set these significant issues aside, I'm very delighted that you deem the concept interesting, at least. The whole nemesis-like reasoning that deals with Sauron is exactly one of the strong points of the proposal. Bear in mind that, even if I don't intend to modify the concept (at this final phase), there is always the possibility that some elements might be ultimately changed or wholly replaced by the Edain Team; and we don't know yet how they feel about this proposal in general. I remit the final decision to their wise judgement, whatever the outcome may be. So, if you're not convinced by some values or aspects, I would personally advise you focus your attention on the foundations on which everything is based. Regardless of your choice, thank you again for your feedback (always valuable for the debate)