Eternal Rest

When you first cast this spell you select a cubed area of 3,000 feet of which a dark purple smoke fills the area. The area is considered heavily obscured and suffocating. At the beginning of the turn of every living thing inside the affected area, they are suffocating and must make a Constitution saving throw or take 10d12 necrotic damage as their flesh begins to rot off them. At the beginning of each hour, a different effect takes place, which is listed by the hour.

1. Humanoid creatures who died lose all their flesh and rise as undead under the caster's command and are immune to the effects of the spell. They can be commanded from a range of 3,000 feet as a bonus action on the caster's turn, and have the same initiative as the caster. Roll 5d6 to determine what type of undead you raise. They last until they are killed.
   1. Ghosts, and Specters
   2. Skeletons and Greater Zombies
   3. Ghouls and Ghasts
   4. Will-o-Whisps and Shadows
   5. Wraiths with one Sword Wraith Commander
   6. Wraiths and Banshees
2. Another wave of 8d10 necrotic damage radiates through the cloud again, creatures who are immune to this necrotic damage are considered resistant.
3. Constructs bodies deteriorate completely and so do non-fortified building structures.  
4. Long dead creatures in the range of the spell such as dinosaurs, dragons, bulettes, buried animals and humans, etc rise up as undead under the caster's command. They are immune to the effects of the spell and can be commanded from a range of 3,000 feet as a bonus action on the caster's turn, and have the same initiative as the caster. If they are underground they will spend their whole action to claw their way to the surface, ignoring all other commands until they are free. These undead last for 10 days or until they are killed.
5. All structures deteriorate and fall into ruin. All living things that have survived this long must make a Constitution saving throw taking 6d8 necrotic damage on a success and are outright killed on a failure. Creatures who pass the saving throw do not benefit from resistance or immunity to necrotic damage.