True wish

Your 5 dragon scales form the corners of a star that link together it fires into the sky and shines bright flying through the sky for this you can make a wish guaranteed to happen and in the way you intend, this can be anything excluding rules about the spell itself. You cannot gain more wishes by casting this spell. Once casted you forever lose your 9th level spell slot and can never cast this spell again, in addition you roll a d6 depending on what you roll will cause a different effect

1.  If a one is rolled, you permanently lose a random spell slot, determined by rolling a d8
2. if a two is rolled, you lose half of your movement speed
3. if a three is rolled, your constitution and dexterity stat is set to a maximum of 12 no matter what
4. if a four is rolled, you become permanently blinded
5. if a five is rolled, you are forced to receive a negative effect from the deck of many things
6. if a six is rolled, you can never speak again.