Gem Trancer

Long ago, a group of dwarves mined into a cave filled with glittering gems. As the Dwarves began mining them, they noticed that some of the jewels seemed to be liquid, and even more surprisingly they found that some moved. Those dwarves began researching these jewels, and the first Gem Trancers, known as the Brotherhood of Mithril, were formed. Over the years, these creatures have become more and more prevalent.

Transform

The Gem Trancer has their symbiote change shape. As an action, you take damage equal to half your level +2, and can choose a different Gem Form to take.

Gem Form: Sentry

While resting, your Symbiote can remain awake and alert for you. Your Symbiote warns you of approaching danger, meaning you can't be surprised while unconscious.

Gem Form: Weapon I

Your Symbiote sense danger, becoming a weapon. You can choose either a Shortsword, Shortbow, or Shield

-Sword: (Counts as Longsword) Your Symbiote becomes a  sword of your design. If an attack lands and draws blood, you can use Transform as a bonus action, and you don't need to spend Health.

-Bow: (Counts as Shortbow) Your symbiote becomes a bow of your design. You can pay up to 3 health to make a Gem Arrorw. When an enemy is hit by a Gem Arrow, they take additional damage equal to the amount of Health spent.

-Shield: Your Symbiote becomes a small shield. It provides +2 AC, and at the end of each of your turns you regain 2 + Gem Treatment Level.

Gem Treatment Level 1

Your Symbiote grows stronger the more it is used, and as such your weapons and tools can be treated. Whenever you gain the Gem Treatment feature, you get 4 Gem Treatment points, and you can upgrade any of your Gem Forms. Weapons and Armor gain an additional +1 for each treatment, and no form can have more points than your Gem Treatment Level +1.

Gem Form: Armor

The Symbiote surrounds your torso, becoming a form of armor. While in this form, your AC becomes 14.

Gem Form: Mount

Your Symbiote can grow in size and become rideable. While in this form, it's considered Large size, but can only carry 1 rider. For each Gem Treatment Level, it can carry an additional person.

Gem Treatment Level 2

Your Symbiote grows stronger the more it is used, and as such your weapons and tools can be treated. Whenever you gain the Gem Treatment feature, you get 4 Gem Treatment points, and you can upgrade any of your Gem Forms. Weapons and Armor gain an additional +1 for each treatment, and no form can have more points than your Gem Treatment Level +1.

Gem Mutation

Whenever a Gem reaches Gem Treatment Level 3, it becomes eligible for a Gem Mutation. Gem Mutations allow the form to keep it's Gem Treatment Levels, while also adding an additional ability.

-Sword: The Sword mutates into something much bigger. Whenever you summon the Gem Form: Sword, it's treated as a Greatsword, and anytime you strike an enemy you can use Transform as a bonus action without paying the health cost.

-Bow: The Bow mutates into something much longer. Whenever you summon the Gem Form: Bow, it's treated as a Long Bow, and you are given Gem Arrows equal to it's Gem Treatment Level.

-Shield: The Symbiote mutates into something much sturdier. Whenever you summon the Gem Form: Shield, it's treated as a Great Shield, and you gain additional health equal to it's Gem Treatment Level.

-Sentry: The Symbiote mutates into something more attentive. While the Sentry is out, you only need half the time required to gain the benefits of a Long Rest.

-Mount: The Symbiote mutates into something more familiar. When you summon your mount, you can choose any CR 1/4 or lower beast.

Bi-Form Manuever

Due to the blood taken in by the Symbiote, it enters into mitosis, allowing the Trancer to have 2 Gem Forms present at the same time. If done, when you use Transform as an action, you can change one or both forms at the same time.

Gem Form: Tool

The Symbiote learns to mimic any tool it has seen. You can show your Symbiote one Artisan's Tools, and until the end of your next Long Rest, it counts as the chosen Tool.

Gem Form: Weapons II

Having experienced in various combat encounters, your Symbiote has learned to change into more weapons.

-Mace: Your symbiote becomes a mace. If you kill an enemy during combat, this weapon deals double it's damage die until the end of combat.

-Scimitar: Your symbiote becomes a mace. If this weapon draws blood, you can use your bonus action to make a second attack.

-Boomerang: Your Symbiote becomes a Boomerang. You can target multiple enemies with this weapon, but each additional target gives you a -1 to hit for each additional target.

-Sword and Buckler: (Counts as Shortsword and Shield) Your Symbiote becomes both a Shortsword and a Buckler. This form counts as one for the purposes of Bi-Form Manuever.

Gem Treatment Level 3

Your Symbiote grows stronger the more it is used, and as such your weapons and tools can be treated. Whenever you gain the Gem Treatment feature, you get 4 Gem Treatment points, and you can upgrade any of your Gem Forms. Weapons and Armor gain an additional +1 for each treatment, and no form can have more points than your Gem Treatment Level +1.

Gem Neurons

Due to the prolonged blood transfusions, you have learned how to perform Transformations faster. Transform is now a bonus action instead of a full action.

Gem Form: Headgear

Your Symbiote has developed a way to protect your head in multiple ways.

-Goggles: Your Symbiote covers your eyes, allowing you to see through it's translucent skin. You gain Dark Vision up to 60ft, and have protection against any effects that target your eyes.

-Facemask: Your Symbiote covers your mouth and nostrils, becoming a filtered mask. You no longer are required to breath, as the Symbiote filters or provides you air.

-Helmet: Your Symbiote covers your head and ears, giving you an additional +1 AC and providing protection against any effects that require sound.

Gem Treatment Level 4

Your Symbiote grows stronger the more it is used, and as such your weapons and tools can be treated. Whenever you gain the Gem Treatment feature, you get 2 Gem Treatment points, and you can upgrade any of your Gem Forms. Weapons and Armor gain an additional +1 for each treatment, and no form can have more points than your Gem Treatment Level.

Gem Mutation 2

Whenever a Gem reaches Gem Treatment Level 3, it becomes eligible for a Gem Mutation. Gem Mutations allow the form to keep it's Gem Treatment Levels, while also adding an additional ability.

-Armor: Your Symbiote becomes quieter. You gain advantage on stealth checks while in this Form.

-Tool: Your Symbiote becomes smarter. Your Symbiote can change into any Artisan's Tools, as long as you feed them to it first.

Gem Fusion

You and your Symbiote have become one. Once per day, you can transform into 1 of 3 Gem Fusion Forms. You remain in this form for 10 minutes or until you are knocked unconscious.

-Attack Form: Your Symbiote consumes you, and releases your inner fury. You awake to 4 arms, each being able to wield a different Gem Weapon without penalty. You also gain +5 to hit and damage.

-Defense Form: Your Symbiote consumes you, and releases your inner compassion. You awake to 2 long tentacles, each 15ft long. As an action, you can encircle up to 8 people within your arms. You and anyone inside the circle regain 1d12 + Con modifier in health at the start of their turns.

-Speed Form: Your Symbiote consumes you, and releases your inner hysteria. You awake to 4 legs and wings, giving you a flying speed of 60ft and movement speed of 60ft. You can also use Dash and Disengage as a bonus action.

Tri-Form Maneuver

The Symbiote once again duplicates, allowing you to have 3 Gem Forms active at one time.

Gem Treatment Level 5

Your Symbiote grows stronger the more it is used, and as such your weapons and tools can be treated. Whenever you gain the Gem Treatment feature, you get 2 Gem Treatment points, and you can upgrade any of your Gem Forms. Weapons and Armor gain an additional +1 for each treatment, and no form can have more points than your Gem Treatment Level.

Gem Mutation 3

Whenever a Gem reaches Gem Treatment Level 3, it becomes eligible for a Gem Mutation. Gem Mutations allow the form to keep it's Gem Treatment Levels, while also adding an additional ability.

-Mace: Your Symbiote becomes much heavier. It is now considered a Heavy Mace, and can be wielded in one hand.

-Scimitar: Your Symbiote becomes much lighter. You can now make 2 attacks with this weapon for each attack action you perform.

-Boomerang: Your Symbiote becomes more agile. When you hit an enemy with this weapon, their movement speed is reduced by 10ft.

-Sword and Buckler: Your Symbiote becomes more refined. Your sword is considered a Longsword, and the Shield provides +3 AC

-Headgear: Your Symbiote becomes more focused. When you switch to the Headgear form, it provides all 3 benefits at once.