Army of the grave.

You return all dead creatures to life that have ever died in a 100 foot radius, the creature/s come back with full hit points and are classified as an undead monster. otherwise the creatures are all the same. spell slots are all ready for use but the undead creature cannot preform this spell. to determine the turn order if in battle the spell caster picks witch creature goes first to last.

This spell also neutralizes any poisons and cures any curse or diseases that affected the creature at the time it died. The spell can't return an undead creature to life. (you can't use the spell on the same creature twice)

This spell brings back any creature even if it is missing it's head or heart (you cannot use the heart of a creature you brought back from the dead to preform this spell) 

the caster can end the spell whenever he chooses bu it automatically ends after 12 hours and it can only be preformed once a day. ( if the spell stretches over midnight you cannot preform the spell both days.

there is no limit to how many creatures could have been summoned. to determine deaths that happened over 10 days ago either roll a d20 or the DM decides the those creatures all have 15 hit points and count as zombies or ghouls. Also all the undead creatures are at the casters command if a player has been reanimated he may take control of his old character.