1 - Secret button, remove brick in the wall
Opens a hidden cache at 2.

2 - Hidden Cache
Contains: Morning Star

3 - Scroll

To open the castle door, you must get a key piece from each of the four clans of Skullkeep.

4 - Beware of the pressure plate
Stand on it and immediately walk back. A fireball otherwise hit you and probably kill you.
After dodging 1 fireball you are safe.

5 - Door puzzle.
To get through the gates you must click the buttons in a specific order.
As you face the center button, press the left, the right, and then the center button, then move as fast as you can through the gates.

6 - Gold Key, Minion Map

7 - Tempest
Once you pick up the tempest, another trapfall opens, leaving you trapped. It cannot be substituted by another item. You need to use the new map you found at 6. Stand at the spot where the tempest lies. Use the minion button on the map. Move back to a safe place, and let the minion retrieve your item.

8 - Firebomb