Dishonored is back with today's 'The Knife of Dunwall' DLC, and along with it come all the Runes, Bone Charms, safe combinations and blueprints that you know and love. You'll need all the help you can get as you face off against new and powerful enemies, and luckily Granny Rags is offering her mystical services with a Rune as the reward. Of course there's a catch, as there always is with the mysterious old woman. In order to snatch the Rune, you'll have to first find the chamber hidden away in the very first section of the DLC, right above and to the left of the first security gate. Once you've entered the chamber, your assassin assistant will apparate to tell you of Granny Rags' presence.

Loot the note on the table to find the recipe that you'll need to concoct in the form of a disturbing rhyme.

You'll need two ingredients to cast the spell:

• A Weeper corpse
• A whale's eye

The first isn't so tough to come by. Head through the security gate and down to the main level of the next area. Proceed to the far right and you'll come upon a pier with two guards patrolling it. Climb down to the small beach beneath the pier and the Weeper corpse will be on the ground. Pick it up and use Blink to get it back up to the room. Drop it in the circle drawn on the floor and you'll be good for step one.

Step two comes much later in the level, and can be easy to forget or look over. Proceed towards your main objective in Rothwhile's office until you come upon the hanging whale just outside his office door. The whale will still be alive, but you can euthanize the poor beast by fetching two Whale Oil tanks and plugging them into the power station on the back left-hand wall, just next to a table where you'll find another Rune. With the Whale Oil tanks in place, head up the stairs and flip the switch on the dashboard the electrocute the whale. Now that it's dead, you can walk around its side, look up, and pluck out its eye.

Return to Granny Rags' room in the last area and put the eye in the pot to complete the recipe.