Create protection from the dead and undead's souls in order to protect the caster from all beings who are willing to risk their soul, to kill you themselves.
definite defence: For 1d4+1+(1 for each higher spell level) turns the caster gains additional 4+(1 for each higher spell level) AC.
backlash from beyond: whoever attacks you, no matter the range, take 2d4+2 necrotic damage and if they hit you add 1d8 necrotic damage and on death if the attacker dies due to this damage add 1 to your AC.
unruly undead: When an undead creature makes an attack against you, they must make dc 4+(spell casting ability)+(half of spell level) constitution saving throw, on success take an additional 1d4 necrotic damage, on failure the creature is absorbed, if the creature has a phylactery it revels the location of said phylactery for one minute, into the undeathly protection adding 1 to your AC and an additional 1d4 necrotic damage to your "backlash from beyond" and "definite defence"
"the true creator of this spell wanted to make sure that any undead should be freed from the chains of life, freeing them to whatever afterlife they go to, some of the the undead are evil, some are good, but they should be in the place they belong after everything in life so this was made to protect the user from the unruly to send them to wherever they are going after this and strengthen their resolve, so take this and let the dead rest until they are needed for another to rest"
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