The Eldritch Plague

You have found an eldritch pathogen and are infected with it.  Pick a warlock patron

When you make a Physical melee or ranged attack, you can cast eldritch blast as a bonus action. The damage type will depend on what warlock patron it is.

fiend. The blast will deal fire damage

great old one. The blast will deal psychic damage

archfey. The blast will deal no damage, but will displace the target 30ft in a random direction in a similar fashion to the infestation cantrip.

hexblade. The blast will deal force damage but will be a melee spell attack.

celestial. The blast will deal radiant damage to hostile creatures or can heal a friendly creature.

Undying. Your damage is necrotic and you heal the damage dealt.

Undead. Your damage is necrotic.

Genie. Pick a element: fire, earth, air, water. You deal fire (fire), bludgeoning(earth) or cold(water) damage. Alternatively, you my push the target 10ft towards or away from you (air).

Fathomless. Your blast deals cold damage. You can forgo the damage to grapple the target.

Charisma is your spellcasting modifier.