What do incendiary devices primarily produce?

Incendiary devices are specifically designed to produce significant heat and cause fires. Their primary function is to generate intense heat that can ignite materials and produce burns. When activated, these devices release energy in the form of heat, leading to combustion and often resulting in widespread damage through fire.

In contrast to options that suggest increased explosive power or minimal damage, incendiary devices do not focus on explosive blasts as a primary feature but rather on the ability to sustain and spread fire. Additionally, the idea that they would reduce heat production contradicts their very purpose, which is to create extreme heat and potential for ignition. Therefore, their role in increasing heat production and causing burns aligns directly with their intended function in causing fires and destruction.