The thing that I find really intimidating is when I think about how the Cabal Skyburner vessel charged right through that superweapon blast to ram straight through armor that even the Queen's Harbingers couldn't penetrate.
[spoiler]As Oryx didn't hesitate to use the fleet obliterating super weapon on Eris' lone, one manned jumpship, it is a no brainer that Oryx would use it immediately upon detecting an obvious Cabal warship on an intercept course.[/spoiler]
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Maybe he didn't think the cabal would dumb enough to do it.