After meeting with your old teacher, follow him  while ignoring "sightseeing" for now. After a long walk, you will reach the protest site .
Watch a short cutscene and follow the golden trail to the resistance headquarters, hidden in the sewers . Once you reach the end of the tunnel, another cutscene will begin . After watching it, go to Page's office.
Listen to what the resistance leader has to say  and teleport to the Road to Rule. Time to open the next gate . There's nothing interesting behind it, but if you like magic you can buy Force Push. Once you're done with the upgrades, return to the sewers.
To get in favour of the citizens of Bowerstone Industrial, you have to complete a side mission  of collecting 100 Guild Seals. Once you're done, return to the headquarters .
After listening to the rebels, Page will give you the clothes you need for the party. Change into it in the Sanctuary  and follow the golden trail to the Reaver's mansion in Millfields .
Once inside, follow the butler to the main hall , where the game prepared by the landlord will begin. Reaver will be turning the circle , opening the gates on the arena and your task will be to defeat the groups of monsters.