Fasha being immortal , short of being immaterialised by a Fedain, ties in with the demon physiology , yet he appears to have patience and control over their innate rapacious nature. Perhaps once human and a colleague of Grimm, Veil , Neredos and Prism who actively managed to become more demonic in nature . If Salidar is concerned of the compromise of his safehole, and bearing in mind that he must anticipate that Maxthane may try to stop him , wouldn’t he simply go for the other pillars? I fear that just focusing on the pillars of the original plan is shortsighted ! I hope Maxthane finds some allies , possibly Styx and co?