Incendiary Core
Incendiary Core is required to build and upgrade Incendiary Turrets, Sniper Turrets, and Heavyweight Turrets. This item can be purchased via the Store, won via Zoot's Loot, given as a prize in the Defense Simulator, or found in Terraknor Boxes and Incendiary Boxes.
Cost
Winning an Incendiary Core from Zoot's Loot