Instant Dungeon Crawl: Sewers No time to whip up some sewer battle maps? No problem! Here's your solution! Includes full concept battle maps--including a thieves guild hideout , the main drain area and cut away pipe maps for when your dungeon crawl takes you inside the sewer pipes--and a sewer tile set so you can customize your maps! All come with grid versions. Just Add Monsters! Check out the popular Instant Dungeon Crawl line !