Krick-Krick watches with interest as he pulls out his pistol and takes aim. He whispers over the chamber filled with alchemical components packed behind a bullet he made himself and scribed arcane words upon.

"Die in fire you diseased pest."

(1d20+5)[11] vs touch Ac

(1d6)[4] bullet damage
(1d6+3)[7] bomb damage

The bullet explodes if it enters the rats body, a small gout of flame to cook its diseased flesh.