In the years before Lei Shen's rise to power, the mogu clashed against the other races of Pandaria. The mogu fought against the jinyu empire in a battle that lasted forty days and forty nights.
From behind the frontlines, the jinyu waterspeakers hurled columns of water, drowning the mogu forces. They conjured bubbles that lifted mogu into the air, then sent them plummeting to their deaths.
Finally, with the mogu forces nearly beaten, an unknown foot soldier rose up against the fish men. The foot soldier grabbed a basket of the jinyu's long fishing spears, and hurled them over the field of battle with deadly accuracy.
The spears pierced through the waterspeakers' shield, putting an end to the resistance. And so it was that the battle was won.
Afterwards, the Thunder King presented Haqin with a hundred of the finest golden spears crafted by mogu forgemasters. He became one of Lei Shen's greatest lieutenants, and after his death, the spears were buried at his side.