The place at Candlekeep is surrounded by multiple protection spells, and the guarding Magic Arrays are also very powerful. Even a demigod-level mage cannot open a Dimensional Gate there, and there is a silver dragon that has already turned into a ghost. Even if killed, she can resurrect after one day.
If not for this time's magic plague, these measures would indeed be enough to protect this towering castle at the end of the Lion's Road, as there are still many Weave Mages around level 30.
But now, these mages are almost useless... Years of sheltered life have made them completely forget how to cast spells without the Weave.
And their enemies must be those Arcanists.
Hill is very sure that the Naise Remnants will take action against there.
If it were just books, those Arcanists might restrain their greed a little, but there are also Arando's prophecies about the future of Ferun there.