Eternal Guard

Unlike traditional spells which use strings of raw magic to shape reality, by uttering the ancient words the caster uses the primal power of his own soul to protect loved ones from a catastrophe.

After using your reaction to cast the spell you choose up to six creatures within 30 feet of you that you wish to protect. Alternatively, you can choose a plot of land and any non-magical plants on it.

If you have chosen creatures, they immediately regain all of their hit points. If a creature is charmed, paralyzed, frightened, stunned, deafened or blinded the condition ends. Additionally, as long as they are within 30 feet of you and the spell is active they gain the following benefits:

•  Immunity to all types of damage.
•  Immunity to spells of 8th level or lower unless they wish to be affected.
• Automatically succeed on saving throws against spells and magical effects.

If you have chosen a plot of land, for as long as the spell is active the ground 30 feet around becomes sanctified and fertile gaining the following benefits:

• Any plant-life upon it will continue to grow, regenerate and flourish even without sustenance or suitable environmental condition.
• Any source of food or water within it will be purified.
• Any corpse or other remains upon it will be under the same effect as in the gentle repose spell.
• You may choose one or more types of creatures that will be unable to enter the plot of land nor charm, frighten or possess any creature in that plot of land,  by any means possible.
• If a natural disaster such as an earthquake, volcanic eruption, tornado or a tsunami takes place near that plot of land; it will not affect the plot of land itself and any creatures in it.

In return for the protection you grant, you must sacrifice your own life. You bind your soul to your body and your body turns to stone. While petrified you become unmovable and indestructible. No sort of spell, magical effect or divine intervention can destroy or move your petrified body from the place the spell was cast for the entire 250 years that the spell is active. After 250 years the spell ends, its' magic fades and you become a regular stone statue – all the benefits the spell granted to the creatures, land, and your petrified body end, causing your soul and living body to be destroyed permanently.

No spell is able to retrieve your soul or resurrect your body during the spells' duration and after its magic fades, unless a wish spell is used only to end the spell early, freeing you from your petrified state, though the caster will lose the ability to cast the wish spell ever again.

Casting the spell requires true selflessness. The well-being of the ones you wish to protect is all that matters and you must lose all hope to ever being revived or else the spell will not take hold (It's up for the DM to decide if the right conditions were met). For that reason, if the caster's alignment was natural or evil it will become good after the spell was cast and will remain so even if the spell ended early by a wish spell.