Nightmare on the Polar Express is a Fifth Edition adventure for 3 to 7 characters of 3th to 4th level, and is optimized for 5 characters with an average party level (APL) of 3. Characters who survive this adventure should earn half of the XP required to reach the 4th level.
This adventure can begin anywhere, as the characters are quickly whisked away by magic.
The Polar Express is an ethereal, plane-hopping train that spirits away lost and forgotten children to a better life. Few in the cosmos are privy to its whereabouts, and nothing short of a god can derail it.