Curse of Decay

Powerful Cursed Magic surrounds your hands in the form of black and green flames and once you touch a target, wall, or etc will take 10d10 Necrotic Damage as powerful cursed magic flows through the target as their body starts to decay rapidly, and this decaying effect will last forever and once per day you take 2d10 Necrotic Damage as the decay will slowly spread through your body and slowly consume you, this effect can be removed by a Dispel Magic or Remove Curse or Greater Restoration

This spell can also work on inanimate objects and can cause a decay effect on the surface you are touching and can slowly decay that surface, this can cause buildings to slowly crumble away, same with other inanimate objects as well, this effect cannot work on magical objects or items though.

When cast at a higher level you add another d10