Go down again and get the brick inside the lava cave by hopping onto the appearing platforms.
6 | Gold Brick 6
(Video Time 04:11 )
At the battlefield, there is a wooden tower with a cracked wall. Use Earth Spinjitzu, then climb up.
7 | Minifigure 1 | Master of Lightning
(Video Time 04:26 )
Up at the castle, find and smash 5 barrels with a skull on it.
8 | Gold Brick 7
(Video Time 05:23 )
Nearby, there is a ghost cloud spot. Use Possession it it.
9 | Minifigure 2 | Shade
(Video Time 05:39 )
Up the hill, there is a silver patch on a demolished tower. Blow it with Explosives and go through. There is a chest with a silver lock. Again, use Explosives