'There's no mistaking it. This aura is definitely of shadahi origins. But the question remains. Is it possible that there is a shadahi hiding within the Night Lord's Crypt? If that's the case, then the more pressing question becomes how it was achieved without the use of a gateway.'
So far, the only known shadahi in the Mortal Realm was Commander Ekquilore who was summoned via the Gateway of a Thousand Bloodless Hands. However, according to the latest reports, Commander Ekquilore had yet to leave the confines of the Demilitarization Belt.
Needless to say, the shadahi had numerous watchful gazes locked onto his every movement. The moment he decided to step out of the Demilitarization Belt, there was no way news of it wouldn't spread fast.
Furthermore, the shadahi aura Izroth detected from the corridor did not even remotely match that of the Commander Ekquilore he faced back in the Shadahi Realm.