Having trouble coming up with something to draw? No worries - while you'll eventually learn how to start from a tiny seed of a thought and gradually nurture it into a complex concept to explore through design and illustration, it's perfectly fine not to be there just yet.
For now though, here's an idea that might interest you.
The Court of the Rat King
Chess is a game that has been played in its current form for many centuries, featuring pieces like the lowly pawn, to the noble knight and stalwart rook, through to the majestic king and his ruthless queen.
A rat king, however, is a true monstrosity composed of many individuals - not all of whom remain living - who by way of filth have become inseparable from one another.
What do these two have to do with one another? Absolutely nothing - yet. It's your job to remedy this oversight. Pick a classic chess piece and design it around a rat-based theme. Anything that mixes rats and chess, or even battlefield combat will be happily accepted, so feel free to take this prompt in whatever direction you like.