Hive Mind Patron (5e Subclass)
From D&D Wiki
Warlock You formed a semi-physical pact with a hyper-intelligent swarm of insects. Though weak at first, your bond with the swarm increases your combined power exponentially as time goes on. You may use any species of insects for your abilities. NOTE: This subclass is based primarily off of the Entomancer class, which can also be found on this website. The class needed some heavy balancing work, so I decided to simplify it here. I hope you enjoy it!
Expanded Spell List
The Swarm lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.
Swarm Expanded Spells
Spell Level Spells
1st: entangle, inflict wounds
2nd: barkskin, locate animals or plants
3rd: feign death, wall of sand
4th: giant insect, insect plague
5th: cloudkill, contagion
At 1st level, you learn the infestation cantrip if you didn't know it already. This doesn't count against the number of warlock cantrips you know.
At 1st level, you gain the ability to expand the swarm inside of you from the death of your enemies. As an action, you can extend your swarm into the corpse of a Small or larger creature within 30 feet of you, creating a swarm of insects from the body. The swarm acts on your initiative order, and listens to your verbal commands. If you kill a creature with your infestation cantrip, this effect is automatic. You may have a number of swarms under your control equal to your Charisma modifier (minimum of one swarm). Any swarms you are controlling are lost when you complete a long rest.
Stating at 6th level, your swarm has grown large enough to actively come to your defense when you are harmed. You gain resistance to poison damage. Additionally, when a hostile creature within 30 feet of you deals damage to you, you may use your reaction to cast the infestation cantrip on the triggering target.
Starting at 10th level, the hunger of your swarm grows voracious. When you finish a short rest, you can absorb any number of insect swarms from your Corpse Jacking feature. You regain hit points equal to your Charisma modifier for every swarm that you absorb.
Starting at 14th level When ever you cast the spell infection you can cause your swarms to bloat and expand. any number of corpses affected by your corpse jacker feature to explode dealing 3d6 poison damage , and afflictng the poison status affect to all enemies within 30ft