Collectables - The Battlefield
Gold Brick #1
Complete the Bridge Warrior Leader's Quest.
Gold Brick #2
Rebuild the Battlefield Blacksmith for 150,000 studs.
Gold Brick #3
Complete the Blacksmith's Quest.
Gold Brick #4
Get a Gold Medal in the race in front of the siege towers. (I needed a Super Speed character)
Gold Brick #5
Inside a cave of lava.
Gold Brick #6
Up top of a siege tower in the start area, use Earth Spinjitzu to open it.
Gold Brick #7
In the castle area, possess a gate open using a Ghost.
In the area behind a Silver LEGO siege tower. Use Explosives on it and a chest.
Master of Lightning
Smash five barrels with a skull on them in the castle area.