Incendiary Core
Incendiary Core is required to build and upgrade Incendiary Turrets, Sniper Turrets, and Heavyweight Turrets, and upgrade other buildings after Level 9. This item can be purchased via the Store, won via Zoot's Loot, won in the Defense Simulator, found in Terraknor Boxes and Incendiary Boxes, or awarded for 51st in a Sector's Player Tournament.
Cost
Winning an Incendiary Core from Zoot's Loot