Though this thread appears to have drifted a bit...I'm going to comment on the original topic. I'd actually have to say that I think sufficient (at most 80, probably many less, perhaps only a few) Sathanas could probably destroy (blow apart with extreme force or annihilate utterly) a moon.
Reasoning: They can destroy a star. Now, this is, if I recall correctly (and I may well not) probably due to some sort of subspace disruption to the star's stability. However, stars are inherently stable, being extremely massive objects held in a spherical shape by gravity and prevented from collapse by radiation pressure as they fuse their hydrogen (helium, etc, later on) fuel. Now, this is pure conjecture, but given the color of Capella's star, it seems to be in primary sequence, burning by far primarily hydrogen. This means it likely has a very long time to live remaining, naturally. Given that stars also tend to be self-stabilizing (they'll "vent" off extra mass if necessary, if the radiation pressure increases too much, and collapse will increase fusion rate and thus radiation pressure, auto-stabilizing it that way too), it's really very hard to cause a star to go truly supernova when it isn't ready to, meaning out of fuel. As far as I am aware, you have about four options to do so:
1: Cause a pressure-wave in the star sufficient to forcefully collapse the star against the (increasing as it collapses) radiation pressure, and sufficiently powerful that the resulting "rebound" causes what amounts to a supernova. Requires a stupidly large amount of energy. Quite likely more than the sun gives off.
2: Make it stop fusing. Right. Not happening. Maybe in a million years, Shivans.
3: Rip off the outer layers by brute force and propel them at massive speed. Not likely, and may actually require a more absurd amount of energy than option 1...and is really very pointless. Also not a true supernova, basically a forced mass ejection.
4: Create a subspace anomaly that does one of several things:
a: causes gravitational anomalies inside the star sufficient to cause the equivalent of a pressure wave, or collapse, thus causing a supernova
b: causes a removal of material from the core via a subspace tunnel or similar, again causing a collapse/rebound supernova effect.
c: introduces enough extra radiation pressure/matter/antigravitational force via unknown means to tear the star apart or cause it to blow up.
Given that these are subspace weapons, 4 is really the only probable option, I do believe, and likely in fact 4a or 4b. Given 4, the subspace anomalies required to do any of those would probably rip apart most planets or moons (or devour them, whatnot) with relative ease, even if not per se designed to.
There does exist the possibility that Capella did not actually go supernova, that, for example, it was just an enormous mass ejection, but that seems unlikely given the depiction and description, as well as the assumed purpose. I wouldn't really see a point in the Shivans fake-blowing-up a star unless it would give them a tactical advantage - and they'd already pwnt the GTVA by that point.
Given past discussions, I'd say it seems obvious that Capella went truly supernova, and for that to happen, even just the energy required to trigger that would probably make a rapidly-expanding cloud of debris - and possibly atomic-level dust - out of most moons. Thus even just one Sath, or a few, might be able to pulverize a moon with quite reasonable effectiveness.
Random note: first post here, ever. And what a random - and lengthy - first post it is.