Devouring Flames

Devouring Flames is a passive talent.

In-game
The final bonus is limited by the amount of points allocated (up to 5, to a total of 10%), and calculates per Burning effect, not per enemy, so to reach the maximum bonus, the Sorceress may either have multiple Burning effects on a same foe, or multiple Burning foes, or a combination of the two. Remember that each Burning effect only applies once per spell, so it's not possible to stack more than one per distinct spell on the same enemy.

Note that the bonus applies only to direct (instant) damage, so it does not empower the Burning effect that trigger it.