[Arcavius inquires about the spire itself]
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Arcavius walks up to the librarian and mentions that he is curious as to what the different spires of the mages tower represent and the different roles of the more renowned mages of the mage tower are, though he is particularly interested in knowing what the role of Solus was and what his spire represented.
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The librarians seem confused. The Spire has one spire, that's why its called Maleen's Spire. It has several rooms in it, referred to as spires, but they're just rooms.
Solus was some kind of researcher, now dead. He was of little importance.