Azeroth, Firelands.

In a colossal cavern filled with flames and lava, the five guardian dragons were locked in fierce battle with bizarre elemental beings.

Boom!

The river of lava surged, countless streams of molten rock converging into a solidified, sun-like lava fireball. With a roar from the lava monster, the fireball, carrying intense heat waves, was hurled viciously at the Black Dragon King.