Having one really great hero and some great national units isn’t a complete panacea for Empyrean’s woes. Only one civ can obtain Chalid and once he’s accounted for there’s significantly less incentive to adopt Empyrean. In addition, vicars take a healthy amount of time to mature into Luridus for non-spiritual leaders, and by the time you get them the game might already be decided.
I do think that radiant guards are far from useless though. Yes, they do become outclassed by champions, but that isn’t horrible because radiant guards upgrade to champions so you can build a few radiant guards, upgrade them to champions, and then have a stack that can cast blinding light. Similarly while Rathas are “only” as powerful as chariots, they have a rare bonus to fighting recon units. This is a situational benefit to be sure, but most of the religions have strong situational uses.
As for revelation, yea, I wish I did more, but any counter to shadows or, Infernal help you, Angels of Death is more than welcome. One annoyance I do have with revelation is that it doesn’t reveal units hidden under Nox Noctis’s veil ability.
It might be fair to say that Empyrean w/o Chalid is the weakest religion, but something has to be.
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One option to boost Empyrean would be to allow ecclesiastics to upgrade into radiant guards. This would give Empyrean a strong disciple-based fighting unit similar to RoK’s paramanders and the Order’s crusaders, however it is really only exploitable by players (ie not the AI) and it would give altar focused players a sick, sick advantage. Toying with this notion, you might be able to balance it out by making RGs strength seven disciple units w/ no metal, similar to crusaders, but that basically becomes a rehash of RoK and the Order.
More interesting would be an additional building for Empyrean civs, maybe a happiness increasing one, either by reducing war weariness and the “we want to return to the motherland” unhappiness, or just giving a straight up happiness boost. Such a building might also give a minor science, culture, or maintenance boost. Or, even better, maybe Empyrean civs could choose from a stable of several different buildings that provide such a boost, but could only construct one in any given Empyrean city. So, science boost in one city, trade boost in another, happiness in a third.