Note: v1.3 of the game is required. Enter the "Settings" screen in your inventory and tap the "1.3" button located just above the "Done" button to display a cheat menu with options to change levels, select your location, and get items.
This is a save game state that gives you plenty of items, health, The Ravensword, and money. A jailbroken device and either the "iFile" Cydia app or an SCP program such as WinSCP are required to access your device's file system. In your device, navigate to the "Ravensword.app" folder directory. This is ususally in "/var/mobile/Applications/". Once you find the folder, there should be four sub-folders: "Documents", "ravensword.app", "Library", and "tmp". Open the "Library" folder. Open the "Preferences" folder. Back up and save the file" com.chillingo.ravensword.plist" in a different directory. Open up the "com.chillingo.ravensword.plist" file and replace its entire contents with the following lines:
Save the file. If using a computer to do this, make sure you overwrite the previous file with the modified one. Make sure the file's permissions are set to "0755". Note: If you are using "iFile" app, set the permissions to read, write and execute. Reboot your device and start the game.
Where do you find the singing rune?
Answer from RaiderOfTombs
I got it by completing Kelton's Quest (find his daughter, who is locked in a dungeon cell). The dungeon is in the forest, to the left of the old ruins. Kelton gives it to you as a reward for finding and releasing his daughter.