>>5326994From reading the aforementioned book I believe the implication was that the 3rd legion was still being affected Blight and this was deemed to be the 'flaw' because none of the other legions suffered so thoroughly and so mercilessly from it. Even when other legions were already well and truly over it or had purged it, it was still a danger to them.
The "ticking time bomb" as it were when they should have been over it.
The book Chiurgion supposedly has more info, I'll see if I can find it.
Also evidently, even worse, before the blight itself a large shipment of 3rd Legion was lost in transit in one of the Fabius Bile novels. This ended up being the work of Trazyn.