With a [Solar] Solar subclass equipped, defeat targets affected by Scorch, defeat targets with abilities, and cast your Super.
Some Solar abilities Scorch your targets. Scorched targets take damage over time, and this damage increases as your target accumulates Scorch stacks. After enough Scorch stacks are applied, your foes ignite in a large explosion.
To make progress, equip abilities, aspects, fragments, or gear with the Scorch keyword. For example, the Ember of Char fragment makes your Solar Ignitions spread Scorch to affected targets.
For many Guardians, Solar Light is the easiest to wield and comprehend. Everyone understands the rejuvenating power of a sunbeam or the sharp burn of a flame.