This material is (as has been noted previously) extremely self contradictory.
It is stated as being immune to radiant energy, yet Aether weapons affect it. Since 'pure' energy cannot exist it either acts by creating some form of particle energy or (more likely, based on how it looks) creating photonic energy. Either way though, it is no different than a particularly powerful laser or particle beam. And no, it cannot posses 'infinite energy density', as the zero-point field is not infinite (though, should it exist as currently theorized, it is so large it amounts to the same in most situations) since there exists a cutoff point at the Planck frequency. Either way, the actual energy of the weapons must be far, far below this, due to observed effects. If it was anywhere remotely close to the theoretical energy density (I am talking like within 70 magnitudes of it) it would have such high energy density that it would create a black hole as it fired (which also means the beam would not travel anywhere, it would just end at the tip of the gun, where the black hole formed), which would necessarily consume the gun and then the armor/ship it was attached to. Since this does not happen, we can place a upper limit on its energy. I frankly don't care to spend a hour of my life atm doing the research to calculate that limit, but suffice it to say that it exists.
The second thing is that it must have a conventional atomic structure (with electrons, protons, neutrons; all that jazz) to be affected by antimatter, since AM particle will only react with their normal-matter pair. This also means that the strength of the shit must also be limited by atomic-bonding strengths and by the fact that, like all matter, it is mostly empty space (which would allow very high frequency waves to pass through it unhindered).
This conclusion is supported by the fact that it is damaged by molecular disruptors, which as there names suggests, work on molecules.
,
Vesper