Shimmering Citadel : Poets Palace : The First Mirror.  

The first of four access quests inside of the Shimmering Citadel, Poets Palace. This quest grants access to the second floor. It is initiated by gazing into (inspecting) the mirror in the third room on the first floor.

You must slay groups of an enchanted novel continuously on both sides of the scriptorium until a marble table pops up next to the divider between the areas. Clicking on this table will end your quest.