Firstly you will have to fight Hobbes . There will be three waves of monsters. The first and second shouldn't be too problematic , but the third one is rather difficult. Normal and armoured soldiers and mages will start appearing from all corridors. Firstly eliminate the mages, then the riflemen and the normal ones last. Area spells combined with ranged weapons will work best.
Once the fight is over, return to the main hall and head to the next arena . This time you will have to fight Hollow Men , so equip a proper pistol. A good idea is to run to the side, wait for the enemies to take interest in your companion and kill them all with some powerful spell.
On the third arena you will meet mercenaries . Just like during the Hobbe fight, firstly kill those attacking from a distance  and then the normal warriors. After the fight, the second to last level of the "game" will begin.
It's time for completely new enemies - Sand Furies . They seem dangerous, but they're not difficult to defeat. Keep hiding behind the pillars throughout the fight  (avoiding getting shot) and eliminate the enemies one by one. The rifle works best here, as it's hard to catch multiple enemies in the spell.
Once all the Furies are gone, return to the main hall where the last fight will begin. Your enemies will be Balverines . The enemies are not only strong, but also very fast. To not use too many health potions, try rolling all the time around the room and only shoot the chosen Balverine from time to time . A good time to attack is when one of the monsters starts fighting with Page. You can then take care of the others. Balverines aren't high in numbers, so area spells aren't very useful, just like in the previous fight.
After killing the last Balverine, watch the cutscene , sign another promise and teleport to the Road to Rule . Upgrade your weapon of choice and return to Albion.
Now you can head to Bowerstone Castle  and listen to the king's speech or complete some newly unlocked side missions first . Their description can be found in the further part of the guide.
Once you reach the castle, watch a cutscene  and return to the headquarters in Bowerstone Industrial . After hearing out Walter's plans, it's time to head to Aurora. However before you follow Finn in search of a ship, it's worth to take care of all the important things in Albion. You won't be returning here for some time.
After completing all the side missions and doing some shopping, follow the golden trail to the other end of the sewers . Once you're in the docks, follow your companion to the gate and listen to his conversation with the guard .
Unfortunately the trick won't work, so you'll have to use force . Wait for Finn to draw the enemies' attention and then kill everyone with area spells. You can also use the nearby barrels by shooting them with a rifle .
After the fight go into the warehouse , climb the stairs and jump down on the other side .
The golden trail will lead you to another group of enemies . Defeat them just like before, talk with Walter and go onboard the ship .
After a short cutscene  you will land on the shores of a new continent .