If Sargeras swung his massive sword into the ocean instead of jabbing into silly place, he could have wiped out half the world’s population with a massive tsunami hitting both major continents.
I imagine that if he had stabbed the maelstrom that the sword would have just harmlessly gone through the portal
On topic:
The Warlock affliction Scythe kills basically everyone it comes in contact with…
The destro staff is why “Outland” in TBC doesn’t look like “Draenor” in wod
And I think it was the Blood DK axe that is like sentient and also murders everyone… but it’s been a while…
Beyond those, it appears that Knaifu waifu is actually some kind of imprisoned lesser old god type chick, that we free from the dagger in upcoming patches.
He wasn’t looking to kill people though, he wanted to kill the planet and its soul.
Killing most of the people would have been contrary to his goals since they would be the only ones who could stop the world from being corrupted if he failed in his last ditch effort.
probably the scepter of sargeras, a wepaon that’s woven into the very fabric of space and time and that’s powerful enough to open a portal even a titan could use.
runner up would probably be the affliction scythe
There are few things in creation that Sargeras fears. The Deadwind Harvester, Ulthalesh, is one of them. The necrolyte Sataiel regrets that she did not attempt to slay the fallen titan with it when she had the chance, so she will test whoever dares to wield the weapon in her stead. Ulthalesh does not mind. The scythe’s master will either overcome Sataiel or be consumed, which will only make the blade more powerful. And then another bearer will take their place. And another.
Ulthalesh has been playing this game with Sargeras for millennia. He knows the meaning of patience.
The Nerf Bat. Only the gods can wield such a potent weapon and none can escape its wrath. They say the poor souls who are damaged by it become salty and unplayable.
I still stand by my answer, the question asked which would be the deadliest weapon not how it was used. This would still wiped out a fairly large portion of the world’s population including the complete destruction of Stormwind, Orgrimmar, and Undercity.