Black Death

OK this is good but you should make it enchantment, remember the crap guide to wizard

conjuration poltels and make stuff for free, with enchantment, buff or debut or inbetwen

Instead of saying the spell causes uncontrollable vomiting and high fevers, you could say that the target must succeed on a Constitution saving throw or be poisoned for the duration. While poisoned, the target is incapacitated by uncontrollable vomiting.