Otherworldly Patron: The Symbiote

Unlike most of patrons, symbiote is spreading itself through spreading its "parts", that connect and bond to various individuals. The Symbiotes bond with their hosts, creating a symbiotic bond through which a single entity is created. They also are able to slightly alter their hosts' personalities, and/or memories by influencing their darkest desires and wants, along with amplifying their physical and emotional traits and personality, granting them various abilities. Cults of this deity type are mostly hidden and looked down upon by most of the other cults and churches.

 

Expanded Spell List

The Symbiote 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:

Spell level	Spells
1st	Absorb Elements, Inflict Wounds
2nd	Web, Alter Self
3rd	Haste, Animate Dead
4th	Polymorph, Vitriolic Sphere
5th	Contagion, Dominate Person

Host of the Patron

Starting at 1st level, your body has been altered and improved by the Symbiote in order to slowly evolve you into something greater. You gain resistance to poison and acid damage, due to essence of Symbiote is now flowing through your body. Also, your hit point maximum is increases by 2 for each level in this class.

Also you need to eat and drink twice the usual amount.

At 14th level, you become immune to poisoned condition, poison and acid damage.

Parasitic Offspring

Note: This ability only exist if you have chosen the "Pact of the Chain", otherwise this ability will not be available.

At 3rd level, if you have selected the Pact of the Chain, your patron will create your very own familiar, causing creature to burst out of your mouth and appear before you. This creature is known as a "Parasite", which follows the rules of a familiar. The creature appear to look like a worm, yet it's whole body is made from dozen of twisted tentacles. Additionally, when you can use your bonus action to allow your familiar to use its reaction to make one attack of its own.

• -Tiny beast, unaligned
• -Armor Class: 12   (Natural Armor)
• -Hit Points:  14 (6d4)
• -Speed:  20 ft., burrow 40 ft.
• -STR: 5 (-3), DEX: 17 (+3), CON: 10 (0), INT: 7 (-2), WIS: 12(+1), CHA: 10 (0)
• -Skills: Stealth +5
• -Senses: Tremorsense 120 ft., Passive Perception 11
• -Languages: Understands Common, Deep Speech, but can't speak
  
• -CR: 1
• -Shapechanger. The parasite can use its action to polymorph into a beast form that resembles a bat (speed 10 ft. fly 40 ft.), a centipede (40 ft., climb 40 ft.), or a toad (40 ft., swim 40 ft.), or back into its true form. Its statistics are the same in each form, except for the speed changes noted. Any equipment it is carrying isn't transformed. It reverts to its true form if it dies.
• -Magic Resistance. The parasite has advantage on saving throws against spells and other magical effects.
• -Invisibility. The parasite magically turns invisible until it attacks or until its concentration ends (as if concentrating on a spell). Any equipment the parasite is carrying is invisible with it.
• -Bite (in Beast Form): Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1 piercing damage.

The parasite has only one attack in it's true form, which is known as "Parasitic Invasion." As an action, if your familiar is within 5'ft away from a target, it can dig through a target's skin and start to consume its flesh. Parasite makes a melee spell attack roll with your warlock spell attack modifier, on successfull hit it digs through. For 1 minute, at the beginning of each of creature's turns, it must  make a DC 15 Constitution saving throw. On a failed save, the target has disadvantage on attacks rolls and suffers 5 piercing damage(that counts as magical). Constructs, elementals, and undead automatically succeed on this saving throw. At the end of the duration, or when the new host is reduced to 0 hit points, parasite is ejected from the hosts body, and lands in a space adjacent to the creature.

After parasite has left the body, you can use your bonus action to devour parasite, to gain temporary hit point equal to the total damage dealt. You can use this feature once, until long rest.

To ressurect familiar you need to ritually devour 2 pounds of fresh flesh. At the end of the 10 minute ritual your familiar will burst out from your mouth.

At level 8 the DC of Constitution saving throw becomes your Spell DC, the damage is increased to 10 and the target become stunned untill the end of its turn.

Poisonous overwhelming

At 6th level, when you cast a spell or use an ability that deals either poison or acid damage, you may ignore your target's resistance to those damage types. Also you can change damage type on your spells or cantrips to acid damage.

Additionally, the patron bestow his gifts upon you, you gain bonus eldrich invocation on 6th, 12th and 18th level.

At 14th level, you can also ignore your target's immunity to those damage types.

Symbiotic Power Surge

At 10th level, your patron will try its best to keep you alive. During death saves you can add your charisma modifier to death saving throws(Minimum of +1).

Also you can cast any spell from your expanded spell list  without expanding a spell slot using this feature 3 times until a long rest.

Full Symbiotic Tranformation

At 14th level, as an action, you can channel terrifying amount of your patron's power through you and cause your body to undergo a horrific transformation. You can't use any bonus actions or reactions on the same turn. Numerous tentacles wrap around the warlock's whole body and form a slimly cocoon, which then burst open and reveal a monstrous creature within. You transform into large monstrous creature that has toned, leaner physique. Head of the creature is eyeless with a constant lipless grin, most of it's body is covered in exoskeleton, and has four long, muscular appenages with a long, curved scythelike talons at the end.

While in this form you gain the following abilities:

-You can’t cast spells while in this form.

-When you transform, your HP is equal to your HP maximum + your Warlock level. When you revert to your normal form, you return to the number of hit points you had before you transformed. However, if you revert as a result of dropping to 0 hit points, any excess damage carries over to your normal form.

-You gain resistance to bludgeoning, piercing or slashing damage from non-magical attacks, and your AC becomes 15 + your Dexterity modifier .

-Your attacks use bonus from your Charisma modifier, instead of Strength modifier.

-You are consider to be Monstrous. Your size is Large.

-You possess four long appendages that reach up to 10 feet, with scythe-like ends that are coated with acid. As an action, you can attack up to 3 times and deal 1d8 slashing and 1d8 acid damage with each one. Those attacks are considered magical.

-You loose basic ability to perceive the world, but gain blindsight of 120 ft. and tremorsense of 60 ft., burrowing and climbing speed of 40 ft.

-As an action, you can use "The Plague" ability. A swarm of tiny parasites are secreted from your body and fill a 20-foot-radius sphere centered on a point you choose within the range of 200. You can move the swarp up to 30 ft. as your bonus action. The swarm remains for the duration of the form. The swarm's area is considered lightly obscured and difficult terrain. When the swarm appears, each creature in it must make a Constitution saving throw, target will suffer 2d10 piercing damage and 3d10 poison damage on a failed save, or half as much damage on a successful one. A creature must also make a saving throw when it enters the spell's area for the first time in a turn or ends its turn there.

After end of the transformation, you suffer a point of exhaustion.

Eldritch Invocations

If you choose this patron, you can also choose an eldrich invocation from the list below:

Feast for the Worms
Prerequisite: The Symbiote patron
On your turn, when you score a critical hit with an attack roll or reduce a creature to 0 hit points, you can cast any cantrip that targets an enemy creature as a bonus action. You can use this invocation 3 times until you finish a short or long rest.

Poisonous Embrace
Prerequisite: 7th level, The Symbiote patron
Whenever you deal damage with a cantrip or weapon attack, you can use your bonus action to attempt to overwhelm one target with a deadly poison. Target must succeed on a Constitution saving throw against your warlock spell save DC or become poisoned until the end of your next turn.

Puppet Master
Prerequisite: 8th level, The Symbiote patron
You can command your parasite to enter the corpse of a medium humanoid. Parasite will manipulate the cadaver for 1 hour. While inside of the corpse, you can use statistics of Wight, but it looks like body is still alive and well, with healthy skin color, bright eyes, etc. You can use this feature once per long rest.