Swarm Warlock Patron

Your power comes from some little known diety of insects. A strangely intelligent fly had appeared to you and offered you great power in return for using your body as a hive for his kin. Upon accepting the curious creatures offer, your skin became pock-marked with eggs and writhing maggots; you could feel as tiny creatures traveled in and out of your lungs as you breathe.

Initially regretting your strange bargain, you find that the entity had held up its side of the bargain; though you smell of rotting flesh and anything near you can hear swear they hear a light buzzing, some magic sustains you and you feel no pain or discomfort from the creatures infesting your flesh and you feel furthermore a great Eldritch power brewing within you.

The swarm within you wants nothing more than to find food and more creatures to infest. You'll find that others infested with the creatures don't survive as well as you.

Expanded spell List

Spell Level Spell 1 ray of sickness, inflict wounds 2 animal messenger, web 3 ???, feign death 4 giant insect, vitriolic sphere 5 cloudkill, contagion

Carrier

You know the cantrip infestation without it counting against your known cantrips.

Starting at the 1st level, you are resistant poison damage and immune to disease. Furthermore, after being exposed to a disease, you can carry the infection without experiencing symptoms.

Note: Diseases Diseases do not have immediate combat effect as they have incubation periods of hours to days before inflicting their debuff. However; if a single creature is afflicted with an infectious disease it could infect and subsequently debuff a whole castle or whole town; making giving creatures diseases a strategic, rather than tactical decision. At your DM's discretion, you can start the game being infected by a single disease. Collaborate with your DM to decide what disease your character may have been exposed to before the beginning of the game.

Infect

Starting at the 1st level, you can use a bonus action to infect a creature through touching it. Choose either poison or a disease you are carrying. Upon touching the creature, you force it to make a Constitution saving throw against your Warlock spell save DC.

On a failed throw, the creatures is either poisoned or infected with the disease you chose. Poison inflicted this way can be cured with lesser restoration or higher healing magic. Diseases are cured their standard way. On a successful throw or if the creature is immune to the effect, nothing happens. If nothing happens or the creature is infected with a disease without immediate effect, it doesn't know that you tried to infect or successfully infected it.

Once you use this feature, you can't use it again until you finish a short or long rest.

Insect Horde

Starting at the 6th level, upon taking damage from a creature within 60ft. of you, you can use your reaction to rebuke the attacker. If you do so, a cloud of insects emerges from your flesh and covers the eyes and mouth of the target, biting and stinging.

You force the target to make a constitution saving throw against your Warlock spell save DC; on failure, the target takes 6d4 piercing damage from the bites and is blinded and unable to speak until the end of your next turn. On success, the target takes half damage with no further debuffs.

Once you use this feature, you can't use it again until you finish a short or long rest.

Living Hive

Starting at the 10th level, the flesh of your face is so obviously covered in insects that it's revolting to those that see your natural state; granting advantage on intimidation attempts. You may use a bonus action to don or doff a magical disguise to hide or reveal this to others.

The insects within you begin to obviously upkeep your tissues as their hive home. At the end of your turn you may cast lesser restoration on yourself; you may use this feature even while incapacitated.

Full Infestation

Starting at the 14th level, you may use an action to infest a target with insects. Constructs and elementals are immune to this effect. When you do so, you magically fill their muscle tissues, skin and organs with thousands of eggs which immediately hatch into maggots and begin rapidly rotting and eating the flesh of the creature.

The target makes a constitution saving throw; on failure the target is infested for 1 minute, taking 2d6 necrotic damage and reducing its hitpoint maximum by half this amount per turn. On success, the creature takes 2d6 necrotic damage immediately, but isn't afflicted for subsequent turns.

If the target dies while infested with insects; spawn 1d4 Swarm of Insects creatures in its place. These swarms are allied to the player and disperse after a minute. Your GM has the statistics for these creatures and resolves their actions and movement.

You may use this feature a number of times equal to your constitution modifier (minimum of one); you regain spent uses after a long rest.