Undeath Foundation

The caster blesses themself with undead-like resistance.  While under the effects of this spell they will glow with a powerful and flawless beauty.  They will also have all the immunities and resistances of a greater undead.  They will be immune to sleep, charms, poisons, disease, mind-affecting attacks, cold damage, neurotic damage, critical hits, sneak attacks, draining attacks, paralysis, and will make all constitution and charisma saving throws at an advantage.

There are some drawbacks to this spell such as, caster is immune to healing effects while under the effects of this spell.  Such magics will be dispelled like those previously mentioned even if the caster would like to benefit from them.  Also, if the caster is killed while under the effects of this spell, they cannot be raised.  Nothing short of resurrection or wish can bring them back from the dead.