Soul Fire

Soul Fire is a level 15 Destruction warlock talent. It is a high damage direct damage Fire spell which generates 4 Soul Shard Fragments.

Improvements
Decimation (warlock ability) will lower the cast time and mana cost of the next Soul Fire by 50% Shadowbolt or Soul Fire at a target that is at or below 25% health.

Tips and tactics
It is best used as your initial attack for pulling due to its long cast time. In this sense it is similar to the Mage's Pyroblast ability.

This skill is generally one of the warlock's most mana-efficient spells.

For targets under 25% health, Decimation (warlock ability) allows Soul Fire to be cast faster. This passive makes Soul Fire similar to a warrior's Execute.

The long cast time makes it harder to use in PvP as the time spent casting it is time gained for an enemy player to tear you to pieces.