Cosmic Obliteration

This spell can only be cast if the caster is capable of casting level 10 spells. This spell uses a level 9 spell slot but should be classified as a level 10 spell.

You select a creature or object you've seen. You destroy the piece of the target and that target starts to deteriorate. Every round that goes by the target takes 5d12 damage that cannot be resisted. If the target survives any damage it can make a constitution save, on a success the target stops taking damage, objects immediately fail this save. 

A target that survives this spell takes a permanent 1d20+your spellcasting ability modifier to its maximum hit points that can only be reversed by the use of a wish spell.