Ruin

A small star-like orb of compressed magical fire and lava, conjured by the mad sorcerer Vendris Emberbrand. Its power is bound to Solune and so its intensity fizzles down to a somber, amber glow when Solune sinks beneath the horizon.
Ruin floats ~25,000 feet above The Crucible like an ominous symbol of dread, occasionally raining hellfire down upon the continent.
Ruin is infused with a strong gravitational effect, which combined with its intense heat has caused worldwide tidal changes, erratic climate transitions, earthquakes, tectonic shifts, etc. Arcluminus is in a constant state of change largely due to the harsh effects Ruin has imposed on it since it came into existence. More recently Arcluminus has begun to settle into the environmental changes Ruin has introduced, but there is strong reason to believe that total stability will never be achieved.