Shirion may have been a human once. That time is long past. Now, it is an ever-shifting being, its form lost to time.
Brendan stared at the creature in the pale moonlight, transfixed by the silvery petals that glistened beneath that perfect purity. It was not until his final breath that he gathered his wits enough to scream after the thing had descended on him, all muscle and thorns and hard, barklike skin. It was too impossible, even the crimson blossoms that shone in the light of the moon.
These small, luminescent creatures are a distant relative of the willowisp, little bits of orangish light that are attracted by the flames of a fire. When enough of them have gathered around a fire, the fire appears to take on a fuzzy indistinctness.
On a world made entirely of molten rock, there is still life.
The PCs are sent with a diplomat to another country to protect him and do his bidding. There may be some espionage, rescuing, downright bullying, etc. Could make a nice medieval, special operations background.