Call me "Creature", lostling, half-dragon of the planes; ie Corporal John Hearthfeld, Esq. - Assassin/ Enforcer "Rat-snake" .
Starts with scene excerpts, followed by working notes, ends with actual used Character Sheet data.
During a storm the PCs come upon a little boy that plays in the rain. Upon further inspection they discover that he has one eye and a long tongue lolling in its mouth. Spit dripping. It is a demon from beyond that can access our realm during storms, it eats all heads that are not its own, living and dead.