RBG is the English abridged version of Rated Battlegrounds and in German it means rated battlefields. These battlegrounds were added by Blizzard to give players a huge PvP experience. World of Warcraft set the standard for other games. The battlegrounds are there to handle the Horde and Alliance conflict. In 1vs1, 2vs2, or 5vs5 you have a good PvP feel, but in battles it's something completely different.
Battlegrounds are divided among the different levels of heroes, and new to BfA are large battlegrounds, but these are called Epic Battlegrounds. Battles aren't supposed to be unfair, so if you're level 40, you don't want to fight someone at level 120. Therefore, there is only one level difference from 5 in a battle. Of course, there are also unfortunate achievements. Many of these achievements can be achieved by the way, but some are very difficult and you need a well-coordinated team.
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