…is the thing you saw when launching World of Warcraft for the very first time, all those years ago. The two statues on the Dark Portal, greeting you in the loading screen, are your introduction to this universe.
It is time to give Warlocks the ability to transmog Staves into 2H Swords, like Warriors can.
There’s not even a need for a lore explanation. Any item, be it a staff or a sword, can be enhanced to provide additional magical power to the wielder.
If warlocks can run around with 1H swords, then there’s no reason for them not to be running around with 2H swords. Make it happen, baby.