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His body felt as though it had passed through a current from Northrend, coldness flooding through him. The moment he entered the chamber, Nathanos was inevitably stunned by the sight before him.

It resembled the Engine of Nalak'sha in Mogu'shan Palace, except the passage leading to the circular space was much narrower.

Chamber of Heart. Nathanos silently repeated the name as he slowly stepped inside. His footsteps echoed in every direction.

There were countless Titan ruins across Azeroth, but this place had not been built by them. It was a marvel born from Azeroth herself, never before discovered.

The empty circular hall seemed to contain nothing, yet it was actually awaiting the arrival of its key. Nathanos took out the Heart of Azeroth. The Necklace radiated an enticing glow as it left The Witherer's palm and flew above the transparent platform at the center of the hall. Azerite spilled from the necklace like fireworks, splashing across those dormant mechanisms.

Nathanos heard turbines beginning to turn, like a river breaking through its ice in early spring.

Everything began to operate...

The assault was endless. Another launched fireball crashed into the walkway atop the city wall. Not every part of Orgrimmar was reinforced with steel. The wooden floor collapsed beneath it, along with one unlucky fellow who fell through.

Nazgrim might have been the only one still strolling about at an unhurried pace. The other soldiers were nowhere near as composed as he was. One Kor'kron carrying a sniper rifle nearly ran into him while adjusting his firing position.

The battlefield could be divided into three areas: the ground, dominated by Iron Stars; the sky, dominated by Wind Riders; and the city walls. With the first two areas secured, the rebels could not possibly breach the walls. The Iron Stars stood