Dreamsurges are a public event in the Dragon Isles that went live alongside other content in World of Warcraft Dragonflight patch 10.1.7 that previously were a catch-up opportunity for players to earn ilvl 402 gear as well as ilvl 415 gear.
The best way to gear your alts (and maybe catch up your main) during the Dragonflight prepatch phase 2
If you want to get your alts geared and ready to go for Dragonflight, or if you have a little catching up to do on your main, there are a lot of options for you to explore in the next few weeks before the expansion launches, particularly as the pre-expansion event kicks off today.
This isn't what I'd call the best way to gear up in patch 8.3, but it covers the absolute easiest path to decent gear once next week rolls around and the patch drops.
Patch 8.3 is coming out today!
There's a whole host of catch-up gear coming in patch 8.3, available through doing the quests in Uldum and the Vale of Eternal Blossoms as the forces of N'Zoth attack both regions.
Benthic gear is the catch up mechanism that was introduced in Battle for Azeroth's patch 8.2.
We've seen all sorts of gear catch up mechanics in the past, often tokens that are put in place to help people newly returned to the game be competitive in the latest content, without having to spend weeks grinding out the last raid tier.
I've never really been someone to stray away from my Priest for very long.