I think Cambion Citizens would be use
Os Gabella was the Caster Hero, and SHE had paradrop, high withdrawal, and PURE immortality
Judecca doesn't have immortality at all. Furthermore, you could simply suggest that his Tech Req be moved up to Infernal Pact plus Arcane Lore, or Infernal Pact plus Strength of Will.
Perhaps Infernal Pact + Sorcery + Religious Law is best however.
Why let facts in the way of a perfectly good anecdote?

Ok, I realise I made a mistake there, just assumed there weren't two different ones.
Sure it doesn't have immortality and paradrop (WTH were they thinking???) but that doesn't make it un-overpowered! Its still a massive deal for a unit with Channeling III and divine (which is not a hybrid! its just straight better then either) to be available so early. He wouldn't be overpowered if he required Strength of Will, but I'd still think it a stupid unit.
With my as yet-unannounced Nightwatch changes, I believe that Nightwatch units should get mask ... although I see no reason why their current form shouldn't get mask either. Nightwatch units are fairly weak for what they are .... mask would only make them worth building.
However, if you mean that it'd be unfortunate that non Esus players could use the Mask in Nightwatch, well ... I suppose we could tie even the promotion version to the Esus State Religion. However as its a fairly expensive unit, and the Exact SAME cheese can be found in Rathus and Radiant Guards being used by non-Empy leaders, I don't really see the problem.
Its the free one that concerns me.
Giving people a reason to build one is fine, but it should also be aimed at incentivizing the unit, not making free ones thrown into a TT better (which is how I normally get deception

).
Cambion Citizens' main goal is additional Blight resistance for Sheaim only, although I can see the non-Armageddon benefits as well. PERHAPS this should be a National Wonder only.
I think its non-thematic and unnessecary. Blight is a cost of the bargain with hell - the whole point of AV is power...with a cost. To make the AC better for Sheaim, the benefits should be increased, and the costs unmitigated.
Nyx Gate I already explained ... the Demonic Champions would require 30 AC and 160/180 hammers .... although giving them a National Limit of 4 might be more appropriate. (along with the increased cost and requirements)
Sheaim can already get Succubi quite readily through Planar gates, and they tend to make decent Champion replacements, so IMHO, its not really a thematic shift.
Again, its not the actual balance that annoys me (although the whole point is beafed T2 units for no T3), but that its a really silly idea having a gate that leads straight to Nyx, not to mention that if demonic champions exist, they certainly don't exist in Agares Plane.
I fixed the quote. If Eidolons and Paladins were returned to Righteousness and Malevolent Designs, and returned to their original strengths ...
then firstly, having those techs require Fanaticism would no longer be a big deal, which would further prevent the beasts ...
and secondly, with Stronger Paladins, Beasts are less of an issue.
Really weakens the divine line and Hyborem, especially since the divine line is mostly dipped into. Apart from heroes, what is there at Fanaticism then?
The Natonal Wonder change is a gimmick because it is not meant to be a national wonder. It is too useless by itself to be worth the National Wonder typical cost (assuming a hammer increase), and its too USEFUL as a civ-wide building to be reduced to a National wonder.
Why is it not meant to be a National Wonder?
The hammers might not even need increasing (I don't remember the cost) it would just be as much or as little as is needed to nerf the beasts. I'm not sure what you are arguing here...is it current version (useless at any level) or EitB level (which is useful for getting T4 units so IMO worth building in one city).
If its Demon Altar, it raises additional issues which may not have been fully thought out, or fully appreciated.
If you tie Beasts to a new National Wonder, it can give additional lateral Utility (maybe even only +4 undead exp, and no additional demon exp) and create even a greater hammer-blockade to the beginning of the Beasts.
It can. Why does it need to though?
Whereas at EitB, you nerf a decent building, and if you don't increase the cost of the building, the beasts are still built rather quickly. But if you DO raise the cost of the building, you are further nerfing a building that needs no nerf.
The Proposal is to add a new building that can take the hit, while ALSO tying it to demon altar (in the requirements) to increase the hammer blockade.
In what universe is DA useful? You just went through how no units can use it except Eidilons (should be upgraded to) and beasts?
150 hammers is a big increase off a base 480 hammers (for all 4), and if more is needed then just increase it.
How often do you build this building?