Ability Score Increase. Increase one ability score by 2 and increase a different one by 1, or increase three different ability scores by 1. If you are replacing your race with this lineage, replace any Ability Score Increase you previously had with this.

You can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character. If you are replacing your race with this lineage, you retain any languages you had and gain no new languages.

• If you replace a race with this lineage, you can keep the following elements of that race: any skill proficiencies you gained from it and any climbing, flying, or swimming speed you gained from it.
  • If you don't keep any of those elements or you choose this lineage at character creation, you gain proficency in two skills of your choice.

You don't need to breathe.

You have a climbing speed equal to your walking speed. In addition, at 3rd level, you can move up, down, and across vertical surfaces and upside down along ceilings, while leaving your hands free.

• Your fanged bite is a natural weapon, which counts as a simple melee weapon with which you are proficient. You add your Constitution modifier, instead of your Strength modifier, to the attack and damage rolls when you attack with this bite. It deals 1d4 piercing damage on a hit. While you are missing half or more of your hit points, you have advantage on attack rolls you make with this bite.
  • When you attack with this bite and hit a creature that isn’t a Construct or an Undead, you can empower yourself in one of the following ways of your choice:
    • You regain hit points equal to the piercing damage dealt by the bite.
    • You gain a bonus to the next ability check or attack roll you make; the bonus equals the piercing damage dealt by the bite.
  • You can empower yourself with this bite a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.

Whenever you make an Dexterity (Acrobatics) or an Ability Check involving operating or maintaining a Land Vehicle, you can roll a d4 and add the number rolled to the total ability check.

You can cast the Misty Step spell with this trait. Once you cast this spell with this trait, you can't cast that spell again until you finish a Long Rest. Dexterity is your Spellcasting Ability for these spells.

If you have the Spellcasting or Pact Magic class feature, the spells on the Mark of Passage Spells table are added to the spell list of your Spellcasting class.

A second being resides within your body along with you. It manifests physically somewhere on you and relies on you for its survival. At the same time, it offers you knowledge and other assistance, either of its own volition or because of your intertwined nature. The symbiote has its own personality and agenda, which might be at odds with yours. If you ignore the symbiote's desires, it might strive to interfere with you. There is no way to be rid of the symbiote while you have this Dark Gift. Even if you go to drastic lengths, such as severing the part of your body where the symbiote resides, it reappears on your body in another location at the next midnight.

Roll on or choose an option from the Symbiotic Nature table to determine what sort of symbiotic being shares your body. Additionally, you gain the traits that follow.

Symbiotic Nature

Entwined Existence. Your symbiote is a separate entity with its own physical form bound to yours. It isn't a separate creature and relies on you to survive. It has Intelligence, Wisdom, and Charisma scores. The DM sets the symbiote's abilities or determines them randomly (roll 4d6 for each score, ignoring the lowest roll and totaling the rest). The symbiote can see and hear using your senses.
The symbiote speaks, reads, and understands two languages; one that you speak, as well as one appropriate to its nature. Choose one of the following skills: Arcana, Deception, History, Intimidation, Insight, Investigation, Nature, Religion, Perception, or Persuasion. You gain proficiency in that skill if you don't already have it, representing the symbiote's counsel and guidance.

If you die, so does your symbiote. If you are subsequently returned to life, your symbiote revives as well.

Sustained Symbiosis. Your symbiote has a vested interest in your survival and takes steps to ensure it. When you fail a saving throw, you can choose to have your symbiote expend one of your Hit Dice to roll it and add the number rolled to the saving throw, potentially turning the failure into a success. If it uses this feature on a death saving throw, you succeed on the save and regain 1 hit point regardless of the number rolled on the d20.

Once you succeed on a saving throw due to this trait, the symbiote can't use it again until you finish a long rest.

Symbiotic Agenda. Your symbiote has an agenda that drives it, and it expects you to assist it in achieving those goals. How permissive or patient it is in resolving its agenda depends on its personality (work with your DM to determine these details). If you have an opportunity to advance its agenda and don't act on it, the symbiote can try to force your hand. You must succeed on a Charisma saving throw (DC 12 + the symbiote's Charisma modifier) or be charmed by the symbiote for 1d12 hours.

While charmed, you must try to follow the symbiote's commands. If you take damage that is not self-inflicted, you can repeat the saving throw, ending the effect on a success.

Roll or choose from the Symbiotic Agenda table to determine the symbiote's goal, working with your DM to detail the specifics or create another agenda.

Symbiotic Agenda

You gain one Feat of your choice.

You gain proficiency in one skill of your choice.

You don't age, and effects that would cause you to age don't work on you.

When you make a death saving throw and roll 16 or higher, you regain 1 hit point.

You retain your creature type, yet you register as undead to spells and other effects that detect the presence of the undead creature type.

As an action, you can unsettle a creature you can see within 15 feet of you. The target has disadvantage on the next saving throw it makes within the next minute. Constructs, undead, and creatures that can't be frightened are immune to this feature. Once you use this feature, you can't use it again until you finish a long rest.

Whenever you make an Wisdom (Insight) or a Wisdom (Perception) check, you can roll a d4 and add the number rolled to the total ability check.

You can cast the Shield spell with this trait. Once you cast this spell with this trait, you can't cast that spell again until you finish a Long Rest. Wisdom is your Spellcasting Ability for these spells.

Once a creature that you can see within 5ft of you is hit with an attack roll, you can use your reaction to swap places with the creature, and you are hit by the attack instead. Once you use this trait, you can't do so again until you finish a long rest.

If you have the Spellcasting or Pact Magic class feature, the spells on the Mark of Sentinel Spells table are added to the spell list of your Spellcasting class.

Mark of Sentinel Spells

Whenever you make an Intelligence (Arcana) or an Ability Check involving Artisan's Tools, you can roll a d4 and add the number rolled to the total ability check.

You gain proficiency in one type of Artisan's Tools of your choice.

You learn the Mending cantrip. You can also cast the Magic Weapon spell with this trait. When you do so, the spell lasts for 1 hour and doesn't require concentration. Once you cast this spell with this trait, you can't cast that spell again until you finish a Long Rest. Intelligence is your Spellcasting Ability for these spells.

If you have the Spellcasting or Pact Magic class feature, the spells on the Mark of Making Spells table are added to the spell list of your Spellcasting class.

Mark of Making Spells

Whenever you make a Wisdom (Animal Handling) or a Intelligence (Nature) check, you can roll a d4 and add the number rolled to the total ability check.

You can cast the Animal Friendship spell and the Speak With Animals with this trait, requiring no material components. Once you cast either spell with this trait, you can't cast that spell again until you finish a Long Rest. Wisdom is your Spellcasting Ability for these spells.

Starting at 3rd level, you can target a Beast or a Monstrosity when you cast Animal Friendship or Speak With Animals, provided that the creature's intelligence is 3 or lower.

If you have the Spellcasting or Pact Magic class feature, the spells on the Mark of Handling Spells table are added to the spell list of your Spellcasting class.

Mark of Handling Spells

Whenever you make a Wisdom (Perception) or a Wisdom (Survival) check, you can roll a d4 and add the number rolled to the total ability check.

You can cast the Hunter's Mark spell with this trait. Starting at 3rd level, you can also cast the Locate Object spell with it. Once you cast either spell with this trait, you can't cast that spell again until you finish a Long Rest. Wisdom is your Spellcasting Ability for these spells.

If you have the Spellcasting or Pact Magic class feature, the spells on the Mark of Finding Spells table are added to the spell list of your Spellcasting class.

Mark of Finding Spells