Getting to the area known as the Abyssal Library was easier than Raze had thought. This was because the guards were actually stationed in two areas. One was between the staircases that split the areas.
The other was on the large hanging chains that acted as shortcuts between individual rooms. However, Raze and Rayna had already taken an additional shortcut when heading to the Vault.
This allowed them to bypass nearly all of the guarded areas anyway, and it was actually part of the shortcut that Dame originally knew in getting to the library; he had just forgotten about the perfect jumping point, and it wasn't something one wanted to guess because then they would head right to the bottom floor.
Not that Dame wouldn't survive a fall from that far, being at the stage he was, but more so, the bottom floor was reserved for the master and Elders, and they were only meant to be present when being called.
