At the end of “Saving last refuge” quest where you have to fight the husk of elder pannion, after killing him, a portal is created to go back to the council. However, you can create your own portal and go back to the council. When you go back to where pannion was using the portal, it resets the quest where you have to talk to him again.
Reporting this as maybe it can be used to exploit and level up fast in the early game