PsychoMantis

Beware
He comes a-crawling
Through the woods and through the night
Beware
He's coming for you
He'll give you quite the fright
Beware
For on this night
You must be on your toes
Beware
He's on the hunt
Bringing trouble where're he goes.

It is a beautifull day at (place name here), your clan is enjoying the sun while following their daily activities. Suddenly, the peacefull atmosphere is disturbed by the manical laughter of a bright green mirror dragon with gowing pink runes on his skin. The feathers, beads and bird skulls strapped to his wings rattle in the wind as he spins around in the air and suddenly swoops down to land amidst the dragons of your clan. His words muffled by the black rogue mask covering his face, he mumbles

“And each mind that I peered into was stuffed with the same single object of obsession. That selfish and atavistic desire to pass on one's genes... it was enough to make me sick,“

as he stares at a hatchling through the green tinted glasses of his goggles.
With a sudden turn, he walks up to your clan leader and explains:

“We are truly the same, you and I... The world is a more interesting place with people like you in it... I never agreed with the Boss's revolution. His dreams of world conquest do not interest me. I just wanted an excuse to kill as many people as I could,“

as he presses a canvas bag into the leaders claws. The bag is soaked with some unknown liquid, twitches occasionally as something inside of it struggles to get free and reeks of death and decay. Disgusted, the leader drops it on the floor and tries to wipe the liquid off of his claws, but with only little success. Without noticing this, the mirror has already turned around and his gaze wanders over the members of your clan. In a sudden, erratic burst of movement, he jumps into the air and shouts

“From the moment we're thrown into this world, we're fated to bring each other nothing but pain and misery! Embrace the plague, enjoy her gifts!“

before breaking out in laughter again as he flies back to where he came from.
Nobody really dares to get close to the package he left, but you can´t just leave it there, as it´s smell gets worse with every minute it´s sitting in the burning sun. Finally, one brave dragon carefully unties the knot and opens the sack...