Wish granted but you are allergic to cheese cake, swell up and die.
I wish for a sword that can't harm its owner, and the special system it has doesn't backfire, and it never breaks or melts and it's indestructible and I could use it, and that it was invulnerable to other corrupting wishes.
I wish I had a permanent Resistance shield so nothing harmful can affect me, the shield is also indestructable and has no faults, even with corruptable wishes, the shield is imparvious to magic of any kind and can only be used by me, the shield is shaped like a bubble and surrounds me, it cannot be destroyed by anything that can ever be thought of, the shield also doesn't backfire. I would use this shield to get my sword which now cannot be used by anyone but me.