With Dragonflight Season 4 looming, now is a good time to pursue appearances that will be unobtainable for a while after Season 3 ends.
With the launch of Dragonflight Mythic+ Season 3, Blizzard added three unique weapon appearances to former Legion dungeons. Chief among them is Lord Ravencrest's own weapon, Ravencrest's Wrath.
While they won't be going away forever, likely returning when these dungeons return to the Mythic+ rotation, this could take years to happen. As they are unavailable on any other difficulty, and have not been added to the regular loot tables, these will be sunset when Season 3 ends.
Don't forget to go and grab them!