As you cast this spell, millions of mosquito-sized larvae begin to swim through the air, desperate for living creatures with which to spread their pestilence.

Choose a disease you are familiar with when you cast this spell. Any living creature that comes within 10 feet of your wall of disease must make a Fortitude save or contract the disease. This save is based on the DC of your spell, not the normal DC of the disease. Targets immediately suffer the effect of the disease, ignoring its usual onset. They suffer further effects of the disease at the normal frequency.

Additionally, any target attacked through the wall of disease gains concealment.