Cornelius

 Personal Bubble. Any creature of the Cornelius' choice that starts its turn within 10 feet of him must succeed on a DC 16 Constitution saving throw or become Infected. Infected Creatures make all attacks, Ability checks and saving throws with a -1d6 penalty. At the start of each of the target's turns, it must make a constitution saving throw. If the target ever fails by 5 or more of the dc the lose their turn due to a coughing fit. After failing three of these saving throws, the disease's effects last forever unless  cured by Cleansing Touch or Lesser restoration, and the creature stops making these saves. After succeeding on three of these saving throws, the creature recovers from the disease, and the spell ends

Infected. The infected is innately magical and has ability's that strain the body. Its spell casting ability is Wisdom dc16 and spell attack +8 Cornelius has following spells prepared:

Cantrips (at will): Infestation, Resistance

Once per day: Blight, Contagion

Airborne Attack.Cornelius lets forth a cough disease that spread in a 10ft cone in front of you, Each creature in that line must make a DC 16 Dexterity saving throw, taking 9 (3d6) Poison damage on a failed save, or half as much damage on a successful one.

Owie Blast! 

You began a coughing fit in attempts to greatly harm a creature. On a pass you are able to Cough hard enough to Launch blood, bits of disease, and chunks of flesh at enemies. .An enemy takes 3 (1d6) bludgeoning damage and must make Dc 16 Con save, On a fail the enemy takes 10 (2d10) posion and 10 (2d10) acid damage and no acid damage on a successful save, as the blood begins burrowing into the affected creatures body. The user must also make a dc 18 con saving throw to avoid hurting themsevles to much taking 3d10 poison and half as much on a sucsessful save.