Going for the blade?
What we know (not all inclusive): There are tunnels under the city. The ones under the monastary and the ones under the library do not appear to be connected.
The stone gem that Xath now wears sparkled brighter in the library, and it acts like a hot/cold seeker of the magic blades. So the blade is closer to/in the library. So we have to get back into the library, thus we have to get by/through the mages. Correct?
Was a plan ever furthered on getting rid of the mages?
Last I heard as possibility: Someone posses as Selura, Penny (with help) makes a forged document with a false prophesy on it (+30 something before rolling). Gives that to mages to take some place to someone(?) while we as her 'charmed' servants remain there protecting her/helping her/etc.????.....????......?????....