Most Poweful Class

[Golden Yak]

I guess warlock come to think of it. Death knight is pretty powerful too, potentially.

[Nathreim]

A eredar warlock drew circles in the sand and shattered a planet in Velen's short story

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That was Archimonde who was empowered and taught by Sargeras himself. Hardly a good base to measure what warlocks can do. The Vision may not even be real many of Velen's visions are not real which even he himself admits.

[Friendlyimmolation]

That was Archimonde who was empowered and taught by Sargeras himself. Hardly a good base to measure what warlocks can do. The Vision may not even be real many of Velen's visions are not real which even he himself admits.

The Exodar fell away, and there were only vast stretches of darkness punctuated by lights and mystic energies. Then, a sudden rush, and Anduin stood on strange ground under an unfamiliar sky. There were four prominent moons competing for his attention, an amber atmosphere, and rock formations made from the blue-tinted ground twisting in a thousand different ways. Anduin couldn't see any water, but the colored rock gave the impression of warring waves suddenly frozen at the whim of some godlike artist. There were creatures scattered over the terrain and swirling through the sky, so varied and other that they defied description. Colors and different means of locomotion and patterns formed from dance or play or war... little of it made any sense, and Anduin was simply left struggling to grasp the wonderful abstract chaos of it all.
And the Light! He could feel it surrounding him, as strong as anywhere in Azeroth, pulsing and shining through the alien creatures.
The sky darkened. First to an angry red that invaded the amber skies like a premonition of doom. After a few moments, the color began to shift to an ever-more-nauseating shade of green. Flaring comets screamed from the diseased heavens and struck the earth, sending all the poor creatures scattering in panic. The comets stood up from their craters, towering and terrible, and began to rain down death with ruthless efficiency. A rip opened in the air near the prince, and a flood of horror spilled out: winged demons and alluring succubi wielding greenish-yellow fire and powerful magic, destroying everything in their path. After the dark army had finished its deployment, a gigantic form walked through the rift, and it looked too much like the draenei for the prince not to notice.
This last being leveled the rock sculptures around him, clearing a space where he could kneel in the dust made from his destruction and draw symbols of dread power with his clawed finger. When he finished, there was a moment of perfect quiet as the slaughter halted and the entire world waited in horrified stillness.
And then, an explosion.
The unleashed energies ripped the world's surface apart, and Anduin found himself crying out and throwing his arms up in terror, but the magics moved right through him without harm. The Legion marched back into the portal, returning to the dark nexus of the demons' dwelling, and in their wake was left... nothing. Nothing alive, at any rate. Even the wondrous rock formations—Anduin would never know if they were natural or carved by the alien life he'd witnessed—were no more. There was only ash and broken matter. Even the sky was clouded, no longer allowing a clear view of the four moons.

"What world was it? When did this happen?" the prince asked through his tears.
"I do not know its name. Its inhabitants did not speak in ways we understand, and none of the mortal races from this world ever walked there. I call it Fanlin'Deskor: Amber Skies over Wondrous Rock. Given that I doubt the Legion records its victims—or even deigns to recall them—we are likely the only ones in the universe who know it existed at all."

it was a memory, not a vision

[Chipskunk]

I'm really interested in lorewise which one of the most powerful class and why.

Warlocks by far could be the strongest. Until they get consumed by the fel power they use. Fel seems to be the strongest force in use by any of the classes and since warlocks are the only class using Fel...the potential is limitless. Fel magic has been shown to destroy worlds (MU draenor), power huge portals over incredibly vast distances (illidan book lore, considered cannon) Mages would fall in 2nd place, but possibly only because of restraints placed on the use of arcane. Aegewyn (?) didn't follow the rules and lived a very long magic extended life and even fought sarg's avatar.

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The Exodar fell away, and there were only vast stretches of darkness punctuated by lights and mystic energies. Then, a sudden rush, and Anduin stood on strange ground under an unfamiliar sky. There were four prominent moons competing for his attention, an amber atmosphere, and rock formations made from the blue-tinted ground twisting in a thousand different ways. Anduin couldn't see any water, but the colored rock gave the impression of warring waves suddenly frozen at the whim of some godlike artist. There were creatures scattered over the terrain and swirling through the sky, so varied and other that they defied description. Colors and different means of locomotion and patterns formed from dance or play or war... little of it made any sense, and Anduin was simply left struggling to grasp the wonderful abstract chaos of it all.
And the Light! He could feel it surrounding him, as strong as anywhere in Azeroth, pulsing and shining through the alien creatures.
The sky darkened. First to an angry red that invaded the amber skies like a premonition of doom. After a few moments, the color began to shift to an ever-more-nauseating shade of green. Flaring comets screamed from the diseased heavens and struck the earth, sending all the poor creatures scattering in panic. The comets stood up from their craters, towering and terrible, and began to rain down death with ruthless efficiency. A rip opened in the air near the prince, and a flood of horror spilled out: winged demons and alluring succubi wielding greenish-yellow fire and powerful magic, destroying everything in their path. After the dark army had finished its deployment, a gigantic form walked through the rift, and it looked too much like the draenei for the prince not to notice.
This last being leveled the rock sculptures around him, clearing a space where he could kneel in the dust made from his destruction and draw symbols of dread power with his clawed finger. When he finished, there was a moment of perfect quiet as the slaughter halted and the entire world waited in horrified stillness.
And then, an explosion.
The unleashed energies ripped the world's surface apart, and Anduin found himself crying out and throwing his arms up in terror, but the magics moved right through him without harm. The Legion marched back into the portal, returning to the dark nexus of the demons' dwelling, and in their wake was left... nothing. Nothing alive, at any rate. Even the wondrous rock formations—Anduin would never know if they were natural or carved by the alien life he'd witnessed—were no more. There was only ash and broken matter. Even the sky was clouded, no longer allowing a clear view of the four moons.

"What world was it? When did this happen?" the prince asked through his tears.
"I do not know its name. Its inhabitants did not speak in ways we understand, and none of the mortal races from this world ever walked there. I call it Fanlin'Deskor: Amber Skies over Wondrous Rock. Given that I doubt the Legion records its victims—or even deigns to recall them—we are likely the only ones in the universe who know it existed at all."

it was a memory, not a vision

further proof (to me) that warlocks should be #1