One of my favourite stupid D&D tropes is low-level adventures inappropriately scaled for high-level parties, or vice versa. Like:
The thousand-year-old prophecy has come to pass, and a plague of dragons has descended to bring ruin upon the kingdom. The dragons in question are six inches long.
The party’s been asked to chase some rats out of the inn’s basement. Upon investigation, the basement contains a passageway to the underground temple of some forgotten elder god; the temple’s strange energies have transformed millions of rat into a vast hive-mind whose sorcerous machinations will crack the planet in half if left unchecked.
For the second - Did you mean Warhammer: Vermintide?
Nope – it’s not rats-in-a-basement anymore if you make them big gross rat-men with swords. It’s essential that they’re still just plain old rats; the problem is that a. they’re telepathic, b. there’s about a million of them, and c. in sufficiently large groups they can cast 9th level spells. Have fun with that!