Id rather not. War Cleric is still a Cleric. They can use Glorify, and Illuminate and Sanctify are useful for any Cleric.War domain don’t need cantrip to battle,
Rather than creating pseudo cantrip for cleric, you can remove instead all others domains.
What I see when I take a closer look, is at will abilities more complex, versatile, and useful than actual cleric’s cantrip. You make one ability to implement 5 cantrips at once. Using the « ability« term is just a fluff for cantrip.Id rather not. War Cleric is still a Cleric. They can use Glorify, and Illuminate and Sanctify are useful for any Cleric.
I find it strange that a cleric dedicated to the TRUE PATRON OF DARKNESS ABOVE can produce light and a cleric who worships the UNBRIDLED LORD OF THE CORONA VIRUS can curse disease.
Eh. "O Great Darkness, spare this space your deepest attentions, for a short while." "Sickener of Nations, move this illness from this person to some other person I do not know or care about." Prayer works, ya know.
I your idea of gods is different than mine. In my game, Syla, goddess of fire, wants to cover the entire world (including her followers) in flame. She thinks flames are beautiful and everything else is hideous and unbearable. She would never, under any circumstance, quench a fire. Likewise, my god of life, Arasara, cannot endure death and would save even her greatest enemy, even one who had raped her children in front of her. She is the force of life itself. Allowing any living creature to die is an enigma to her. Thus she cannot allow her clerics to kill, even to save the lives of others.
My understanding of gods is that they need to be worshiped to have power (at least, that's the way I've done it, every time I've had a setting with gods), and I'm not sure beings so implacable as you're describing would be worshiped. Beings that need to be worshiped are ... more responsive to the needs/desires of their worshipers.
To be clear, that doesn't mean you're doing it wrong. My current setting doesn't have gods, so I haven't put as much thought into them recently.
In my game, I've defined "God" as conscious but fundamental force of the cosmos. Very few care about their followers, and those who do "tend their flock," do so a very inhuman way. Thus, the gods are feared more than they are worshiped. Syla views her followers the way a smoker views a cigarette lighter. When they stop lighting fires, she deposes of them. No one worships Syla to prevent forest fires. They worship her to watch the world burn, burn, burn.