Spell Corruption Table

The corruption becomes planted in you

Your Magic Veins are damaged. You cannot cast spells till Long Rest. Take 2d20 damage

Your Magic Veins are bleeding. Any spell you cast from now to a Short/Long Rest will cause you to take 1d12 damage X the level of the spell you cast.

Your Mind becomes clouded with Whispers from the Nightmares and it becomes Impossible to concentrate on Spells. If you were already concentrating on a spell it is maintained but you have disadvantage on keeping them up

Your Spell Fizzles up and takes another spell slot with it. If you have none left or only have higher level spell slots left you take 2d12 damage X the level of the spell

Your spell duplicates and also targets your location as well.

Your Spells are swapped. Damage = Healing and Healing = Damage.

Your Spell Fizzles out

Go to the Nightmare Plane

Consult the Dm for Your fate

You take 3d10 Damage

You Polymorph into a Chicken, Sheep, or Cow

Your spell will Succeed or Rolls Max Damage.

You cast Disintegrate

Roll Fortunate Table