From the publisher: The Hidden Current is Blackbyrne Publishing's inaugural adventure suitable for 4-6 players of 1st level (taking them through to 3rd level) compatible with 4th Edition Dungeons and Dragons. Filled with new versions of familiar monsters, printable battle maps for each and every encounter and a completely new monster. As with all of Blackbyrne Publishing's main adventures, we strive to bring you the feel and look of 1st Edition Dungeons and Dragons, utilizing the ease and simplicity of 4th Edition mechanics.