Conjure nightmare

At midnight on a tuesday you must stand inside of a shelter that can protect you from rain. You place the candles in a circle and then you use a compass to locate south-east. You place the scroll in the center of the candles. Then you pour the oil onto the scroll and then you light the candle that faces north-west. Then you take the straw of a broom and light it on the candle. Then you light the two candles in front of the lit one. After this you light the right candle first and then the left one. You place the lash from the black cat's eye on the scroll and then you light it with the straw of a broom. After that you trow the straw in the oil to burn. When you conjure the nightmare, you can command it and if you give it no commands it will act acording to it's alightment. The creature that had a dream about this nightmare, sees it no longer until the nightmare returns to the dream of the creature. If this creature sees their nightmare in the material plane, while awake, it goes insane for 10 minutes and it becomes frightened. When the nightmare enters the material plane it looses much of it's power.