The relationship between Archimonde and Kil'jaeden is actually not as friendly as outsiders imagined.

Among the three consuls of Eredar, Kil'jaeden and Velen were from the same era. The two once had a close relationship and talked about everything.

This is why Kil'jaeden was so angry after Velen gave up on Argus and fled. He believed that Velen had betrayed the deep friendship they had formed for tens of thousands of years.

and

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