What has the author R U Slime written?

There is no author known as "R U Slime". It's possible that you may have misremembered or misspelled the author's name.

Could you please double-check the name or provide more information about the author or their works? This might include:

* The genre of the book or books

* Any other details about the author (e.g., nationality, time period)

* Any specific titles of books they wrote

With more information, I might be able to help you find the author you're looking for.