Combustion

In the Fire Mage talent tree, Combustion sits in the Fire specialization talents, row 3 of 11. It is a single-point node.

Connected above

The tree draws a line into Combustion from Flamestrike and Fire Blast.

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  Flamestrike

  Calls down a pillar of fire, burning all enemies within the area for (345% of Spell Power) Fire damage. Deals reduced damage beyond 8 targets. Leaves behind a patch of flames that burns enemies within it for Fire damage over 6 sec. This spell is cast at a selected location.

• 
  Fire Blast

  Blasts the enemy, critically striking for Frostfire damage. Castable while casting other spells.

Connected below

Combustion leads on to Cauterize.

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  Cauterize

  Fatal damage instead brings you to 35% health and then burns you for 28% of your maximum health over 6 sec. While burning, movement slowing effects are suppressed and your movement speed is increased by 150%. This effect cannot occur more than once every 6 min.

Same row

Also on this row: Ignition and Fuel the Fire.

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  Ignition

  Fire Blast now spreads 50% of your target's Ignite to 1 enemies. Flamestrike applies 15% more Ignite.

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  Fuel the Fire

  Flamestrike has a chance equal to 100% of your spell critical strike chance to build up to a Hot Streak. Flamestrike deals 5% increased damage for each enemy it damages, up to 25%.