From what I think "ether" is.
Since the Fallen once had the traveler on their side and they had great power. I think that "ether" is the Fallen's substitute for 'light'. The servitors are machines made by the fallen before the traveler left them, these servitors could strengthen our guardian's with light (Fallen call it 'ether') if their programming allowed it.
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I mentioned that in another theory I wrote awhile back. Whatever causes the abnormal strength and size increases is likely a substitute for the Light they lost, but its probably ingested using the Diethyl Ether, like medicine is swallowed within a pill.