Tyrith wants you to use the orb on the balcony in Magisters' Terrace.
Description
<Tyrith winces in pain as he speaks.>
Go to the terrace... use the orb.
...They're...feeding the sunwell....
<Tyrith gasps for breath.>
Hurry... They must be stopped... before they can....
<Tyrith dies.>
Reward
Also, you get:
4 40
Progress
Go and peer into the orb, mortal.
Completion
I consider it to be no coincidence that our paths cross this day.
I sense the tendrils of destiny....
Gains
Upon completion of this quest you will gain:
Additional Information