Publisher blurb: The Underdark is an unforgiving place, noises are amplified, creatures skitter across the rocks, is it a small insect or an Umber Hulk! Only through careful exploration can you hope to find your treacherous environment! This high-quality vinyl surface is ideal for staging encounters during your adventures! The mat lies flat for ease of play and is sold in sturdy polycarbonate tube for easy storage and transport. The mat may be marked with WET-ERASE markers to temporarily alter terrain areas or make other notes about battlefield conditions during play. The Game Mat measure 20” x 30” and is marked with a 1” grid. Use with the Drow Sanctum or Temple of Lolth to further expand your adventures, or the Caverns of the Underdark 3D Adventure Set to bring new realism to your Underdark Explorations.