"You'd better watch out,
You'd better not cry,
He senses your fear,
And then makes you die,
Satanas Claws is eating your town!"
For some reason the note got wiped. However, I can tell you that it says...
"Should you face this catastrophic being of pure malevolence and xmas cheer, you can only draw one conclusion - you didn't get your DM a nice present and / or forgot to wish them a happy christmas. You may have also defriended them recently from a popular social networking site and earned their insane wrath. Banished from many a table by the Gods of "come the f*ck on", this fell being may yet be out there, in the cosmic void, searching for universes to devour, civilizations to destroy and presents to give..."