The Scepter of Sargeras was a powerful artifact forged by the cooperation of hundreds of the most outstanding eredar warlocks and the Dark Titans Sargeras himself. It was a miraculous creation created by arcane and fel energies.
And the reason why Sargeras wanted to create this artifact was very simple. It was to allow him to break through Azeroth's planetary shield so that his true body could descend into the world of Azeroth. This idea was born after the Burning Legion failed to invade Azeroth through the Well of Eternity ten thousand years ago.
Unfortunately, the power of Sargeras and the eredar warlocks was still inferior to that of the titans of the Pantheon. The power of the scepter could indeed tear a hole in the fabric of the material world and create a portal, but this portal still could not completely carry the full power of Sargeras's true body.
