Legend Lore: Maegara, the Inferno

Maegera's 50 ft tall body was comprised primarily of living flame. A great being of fire, Maegera's body continuously exuded heat and was similarly unharmed by it. Merely being within 30 ft of the primordial was enough to set most creatures and flammable objects ablaze. Non-magical weapons that struck Maegera were invariably destroyed. It could even damage creatures normally immune to fire.
Uninterested in the war of God's and Primordials, Maegara sequestered itself away, deep below the earth, where it lay dormant. It is said that a Symphony of Madness will one day rouse it from its slumber.