Vanilla World Bosses are way harder than the ones on live servers! It’s a good idea to order a WoW World bosses boost run from a professional crew, and no, the mechanics are the least of your concerns.
Bosses spawn once a week at a somewhat random interval. So without server layering, you can’t hop around looking for a shard where it’s still alive if you missed the chance.
Numerous spawn points make it harder to find and kill it before the enemy faction does.
And to top it off, only one raid group can tap it! So helping allies is counterproductive!
These reasons make it impossible for any shop to guarantee you a successful WoW Classic world bosses boost run! But at least if you order it from BoostBay.com, your group will keep running you until you get the result.