To kill the Sand King, launching a direct assault on Sand City was definitely unrealistic.
The best approach was to lure the Sand King to some deserted place in the outskirts and kill him in secret.
The Water Condensing Stone could solidify the quicksand within the Sand King's body, preventing him from using earth-element abilities to escape underground. So long as they lured him out to the outskirts, Su Yu and Morning Star could kill him without fail.
Thus, over these five days, Su Yu went to Sand City and spent a great deal of time completing quests related to the City of Whirling Clouds Campaign, successfully earning the Sand King's trust.
General Gelink, the highest-ranking traitor among the air elements of City of Whirling Clouds, had been secretly supported by Su Yu through quests.
General Gelink was a close minister of the King of Whirling Clouds. From him, Su Yu obtained a great deal of valuable intelligence and acquired twelve wind passages without shedding a drop of blood.
Therefore, the Sand King placed extreme trust in Su Yu, the intermediary.
The final plan was for the Sand King to fake his own death in Sand City, then have Su Yu deliver his sub-core to the King of Whirling Clouds in City of Whirling Clouds.
Since he was going to fake his death, the Sand King was no longer suited to remain in the city. His fifty-meter-tall body was simply far too conspicuous there.
He hid in a secret base north of Sand City and chose a nearby mountain hollow as the meeting place with Su Yu.
The Sand King came alone to meet Su Yu, without any entourage. It thus became only natural for Su Yu and Morning Star to kill him.
Moreover, the Sand King had truly died