Bellathar's Rain Of Death.

Within 60ft of the caster a great rain cloud is summoned 25ft above the ground, the rain cloud a 30ft wide sphere, releases a downpour of ethereal and ominous rain. every creature of your choosing that is under the rain cloud takes 4d4 necrotic damage the turn it is summoned and every turn they remain under the rain cloud and are not protected from the rain, they must then also make a constitution saving throw of DC 8+spell casting modifier+proficiency or suffer the poisoned condition. any creature that dies under the rain cloud turns into the skeleton monster within 1d4 turns under the casters control. The only way to be protected from the rain of death is to be wearing a cloak, holding an umbrella or find shelter in a cave or building, even if you are covered head to toe in clothes or plate mail, unless it is specifically rain proof you are not safe and will take damage.

Every spell slot higher than 3rd used to cast this spell increases the size of the rain cloud by 5ft and makes it last 10 minutes longer.

The Necromancer Lord Bellathar had long studied the realm of the dead within the ruined land known as Nasus, who's story is told in hubris, sin and fear, long ago Nasus was a prospering floating fortress nation upon the ocean, a foolish Arch-wizard sought to defy the lord of the dead and use the dark arts to grant his dying kingdom immortality, in his haste and his desperation however he tore open the sky and let loose the rain of death, the very essence of the underworld, drowning his home in poison. This spell devised by Bellathar is but only an echo of its true form, only a fool would open the gates of the underworld... one should at least wear gloves.