We've always known maesters to be wary of prophecy and magic, i.e. how intent Maester Luwin is on explaining away Bran's wolf dreams. AFFC's last chapter, however, suggests they actively attempt, and might have once been successful in, snuffing these supernatural factors out of the world. This suggestion stems from Samwell Tarly's chat with Marwyn the Mage. Sam tells the archmaester of Maester Aemon's occupation with a prophecy in his final days, and that Aemon wished to travel to Slaver's Bay to aid Dany and her dragons. Marwyn replies: " “Perhaps it’s good that he died before he got to Oldtown. Elsewise the grey sheep might have had to kill him [...]" He goes on to say, “Who do you think killed all the dragons the last time around? Gallant dragonslayers armed with swords? [...]The world the Citadel is building has no place in it for sorcery or prophecy or glass candles, much less for dragons. Ask yourself why Aemon Targaryen was allowed to waste his life upon the Wall, when by rights he should have been raised to archmaester. His blood was why. He could not be trusted. No more than I can.” Martin, George R. R.. A Feast for Crows (A Song of Ice and Fire, Book 4) (p. 851). Random House Publishing Group. Kindle Edition. The Targaryen Kings were incessantly nagged by dreams of dragons after the last of them died off. These dreams led to many of their demise. Perhaps the Citadel had something to do with the failure of those attempts? In any case if an anti-magic conspiracy exists in Oldtown it was thwarted by Dany under a bleeding star. Was that the fulfillment of a prophecy, or just a chance miracle as GRRM has suggested? Are the maesters right in fearing magic and dragon lords? What are the Faceless Man's intentions infiltrating the Citadel? Clearly there will be some conflict between the Mage and the other Archmaesters when Dany is ready to unleash dragons on Westeros once more. What is this world the Citadel is building?