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Scorpion451
(Edited uphill both ways)

Do we have a trope for what I've come to call as a "Grinding Gap" which occurs in some RP Gs in which when characters reach a certain level of power there is no content available for that level, but still content for later levels. If the player tries to engage the later content they will be slaughtered, yet the old content is not very challenging. This forces the player to repeat previous content again and again to reach the new level of content.
For an example, say a character reaches level 60 in an RPG and there is no quests to complete or monsters to slay levels 61-79, then monsters and quests appear again at level 80. The player must grind the old content to be viable for the new content.
As for examples, I find this in most Final Fantasy games. In between the strongest monsters you'll fight as part of the main game storyline and being able to take down the Superbosses, you'll probably end up grinding a lot of the same old stuff.
This also happens in Pokemon Heartgold / Soulsilver, with Lance's rematch team being level 75 at its strongest and Red's team being level 80 at its lowest. The gap isn't exactly huge, but repeating the Elite Four a few times is really recommended if the player wishes to have any chance of beating Red.
EDIT: This could be considered a trope similar to Empty Levels, but referring to actual in-game content and things to do rather then new powers and abilities.
Edited by Animakuro