This power allows you to draw upon the primordial power of the volcano. You gain +5% heat immunity and +10% heat armour at rank 1, +4% and +8% at rank 2, +3% and +6% at rank 3, +2% and +4% at rank 4, and +1% and +2% for every rank after 4. You also gain +1 heat bypass and +1 auto-absorb per rank.
If you also have Red Dragon Descendant, the above bonuses are all doubled, and you get an additional +2 Attack/Ascendancy and +2 Damage/Power to both your physical and magical fire breath attacks while in Dragon Form.
At rank 10, this power unlocks the Heat Wave spell sigil, with more powerful versions available at rank 20, 30 and 40.