Not exactly. At that point there would need to be a CoE priest who could cast a spell that would temporarily render units invisible even in the territory of the owner of Dies Diei, in order for there to be balance.
(Btw, you are also talking about Revelation, not Reveal. Revelation is cast by Empyrean priests to reveal invisible units and remove hidden nationality. Reveal, which is the topic of this poll (despite the OP's unfortunate use of the term "Revelation" in the title), is only available to units belonging to the owner of Nox Noctis and allows units to forego the invisiblility that Nox Noctis grants them.)