The Elder Scrolls IV Oblivion Bethesda Softworks Master Quest Dungeon 1.0 2013 Plug-in file (esp) Installation: Step 1: Un-Zip the MasterQuestDungeon file. Step 2: Copy file and paste into Oblivion data folder. Step 3: Double-Click the desktop shortcut to Oblivion. Step 4: Click data files. Step 5: Click the Master Quest Dungeon esp file on. Step 6: Crush the Greenwood Cave and it's depths to obtain the Master Sword! Thanks to all! King Moyer