Astner
It's clear from the context that enough energy would pierce their defenses. By saying that it can nullify any form of assault by multiplying it with zero you're implying that there's no limit to their defensive properties.
No, it's clear from the context that there is a specific method which can piece the defenses, and even that method requires a lot of power. The implication being that a lot of power without that method will not do. A bit different.
Furthermore, the notion of that only one power exists that could pierce them only applies to that setting.
Sure, if there's something compatible to the things that can cancel it (the one method, or other LHWs- so equivalents would be powers that draw on similar high-level beings). Not brute force.
From the information given we know that we can express the energy as a function of the Light-Hawk Wings as follows: E(n) = c2ⁿ, where c is a finite unknown constant and n is the amount of Light-Hawk Wings; and since c is finite, 2 is finite and n is finite it follows that E(n) is finite.So if you a character could generate energy greater than E(n), you'd pierce the defensive properties of the Light-Hawk Wings.
No, because that's making the assumption that the wings work by using up their energy to make their defense in proportion to the attack. The wings work by converting incoming energy into a new type of energy, and it is no-where implied that it's energy decreases to do so. Indeed, quite the opposite, it apparently requires a very specific power to do so.
It costs finite amount of energy to make wings, but wings make a barrier of 'pass through this and your energy becomes harmless,' they aren't like a standard Star Trek style shield that counter power with power.
A finite cost to set up is not the same as requiring the same finite amount to knock down. Stasis fields in Known Space, for example, are fairly cheap to set up, very finite cost, you can power one in a battery you can hold, but other stasis fields are pretty much the only possible way to turn them off once they're on. Or in Fate/Stay Knight, Avalon works by removing the defender from offensive effects. It has a finite cost to activate and sustain, but raw force would never touch the one protected, instead you'd need a kind of dimension-piercer effect.
Things with finite energy cost that require specific methods to defeat are not a unique thing, in other words.
More LHWs grants more functions- a single wing is purely defense, multi-wing craft can do a lot more like space-warping, offense, matter transmutation, etc.. Nothing about this implies individual wings are piercable by brute force- indeed, the statements about the one power that exists that can pierce them implies the exact opposite.