The Arcane Symbiote sorcerous origin involves a symbiotic relationship with a magical entity that alters the character's genetics, granting them unique magical powers. This subclass is characterized by the fusion of the sorcerer's essence with that of a magical symbiote, leading to a harmonious cooperation that enhances their spellcasting abilities.

Symbiotic Bond

At 1st level, you form a symbiotic relationship with a magical entity. Choose a type of symbiote from the following options

Symbiotic Bond

Symbiote	Damage Type
Shadowbound	Necrotic
Psionik	Psychic
Shriekling	Thunder
Novakin	Radiant

You can speak, read, and write Deep Speech which is the language you use to communicate with your symbiote. Additionally, you may choose to alter the damage type of any cantrip you cast to the elemental type granted by your symbiote.

Novakin

At 1st level, a magical entity becomes your symbiote. The Novakin are luminous creatures of celestial light that form a bond with strong-spirited individuals that radiate an inner light. The symbiotic relationship provides the sorcerous host with a heightened sense and gains advantage on saving throws against being charmed or frightened.

Psionik

At 1st level, a magical entity becomes your symbiote. The Psionik are cerebral creatures that shimmer in purplish light like crystal and seek a mind with unique qualities to bond with. The symbiotic relationship provides the sorcerous host with mental acuity granting them advantage on intelligence-based skill checks.

Shadowbound

At 1st level, a magical entity becomes your symbiote. The Shadowbound are creatures of darkness that ebb and flow like wisps and bond with fearless individuals. The symbiotic relationship provides the sorcerous host with a heightened sense in the darkness granting them darkvision for up to 60 ft (or an additional 60 ft if they already have darkvision from their racial traits.) 

Shrieking

At 1st level, a magical entity becomes your symbiote. The Shriekling are haunting creatures that ripple in a bluish glow of energy and seek an individual to bond with whose soul has a unique echo. The symbiotic relationship provides the sorcerous host with heightened hearing granting them advantage on any wisdom-based ability checks based on sound.

Symbiotic Resistance

The magic flowing through your body as a result of your symbiotic bond temporarily empowers you and grants you a number of temporary hitpoints at the end of a short or long rest equal to your spell-casting modifier. Additionally, if you are hit by a spell attack with the damage type associated with your symbiote you absorb some of the spell's energy and store it as temporary hitpoints equal to double the spell's level. 

Symbiote Enhancement

Starting at 6th level, when you cast a spell that deals damage of the type associated with your symbiote, you can add your Constitution modifier to one damage roll of that spell. 

Symbiote Resilience

At 6th level, the symbiote's protective influence extends to its host granting you advantage on saving throws against spells and magical effects that would alter your form or mind. Additionally, you can expend 2 sorcery points to become resistant to the damage type associated with your symbiote for 1 hour.

Symbiotic Transcendence

At 14th level, you gain the ability to tap into a state of symbiotic transcendence. During this time you gain the following benefits:

• As a bonus action, a cluster of tentacles grows from a point in your body granting you a walking and climbing speed equal to your current speed. You can also dismiss the tentacles as a bonus action on your next turn. 
• As an action, you may use the tentacles to make a melee attack or against a creature within range. The tentacles are magical with a range of 20 ft and have your Dex + proficiency to hit dealing (3d10) of the damage type associated with your symbiote. 
• As an action, you may use the tentacles to attempt to grapple a creature within range. On your next turn as an action, you may force the creature to make a strength-saving throw against your spell save DC or else be restrained.

You can’t manifest the tentacles while wearing armor unless the armor is made to accommodate them, and clothing not made to accommodate the tentacles might be destroyed when you manifest them.

Heightened Ascendance

Beginning at 18th level, you achieve the pinnacle of your symbiotic bond and can willingly entrust your symbiote to take over your mind creating a seamless heightened state of merged consciousness and power. In combat and while you are unconscious, your heightened ascendance grants you an arcane aura drawing on both the subconscious of the host and the willpower of the symbiote. This aura is 20 ft and while it's active causes hostile creatures within range to automatically fail saving throws against spells you cast. For every creature within the aura that fails a saving throw, you also gain a +2 to the damage of your next attack. As a result of your heightened ascendance, you may also retain concentration on a spell while you are unconscious (unless you have no remaining hitpoints.)