The Banished Gunsmith

At 1st level, your soul been imbued into a handgun, which
serves as your body. You retain any bonuses or features of
your race, and are still considered to be of that race and
type. You gain immunity to poison and disease, you do not
require food, air, or water, and you no longer age. You have
the same AC as your bearer, and you can use the higher of
your Dexterity modifiers to calculate their AC. Whenever your
bearer takes damage but you do not, both you and your bearer
take half the amount of damage instead. You can regain hit
points as though you were a living creature. Your walking
movement speed is 0, and can’t be increased.
As a soulbound firearm, you have the following properties:
You have a range of 60/120. Your attacks inflict 1d10 piercing
damage, and you require no ammunition to fire. You count
as a magical weapon for the purposes of overcoming damage
resistances and immunities, and grant proficiency with
firearms to your bearer. You are not considered a magical
weapon for the purposes of spells like elemental weapon.
Additionally, your spells’ somatic components are replaced
with “visual” components, where you visibly flare with
magical power. You count as an arcane focus. Your bearer
must have at least one hand touching you to enable you to
cast a spell that deals damage with a range other than “Self”
or “Touch”. The exceptions to this rule are eldritch blast and
firebolt, which you learn when you choose this patron.
You can communicate telepathically with your bearer, and
with any creature that speaks a language within 60 feet of you.
This telepathy is two-way, but otherwise you cannot speak.
If your bearer is unconscious, you can move their body and
control their actions, even when they are reduced to 0 hit
points. Each time they take damage or would otherwise be
awakened, you can choose to force them to make a Wisdom
saving throw against your warlock spell save DC. If they fail,
they don’t awaken.
Whenever your bearer makes a skill or ability check,
you can choose to make the check in their stead using your
statistics.
Your form is permanent, and you can’t be affected by Wild
Shape, polymorph, or any other spell that would change it.

Expanded Spell List

Extra spells

1st command, compelled duel
2nd detect thoughts, knock
3rd conjure barrage, lightning arrow
4th locate creature, phantasmal killer
5th dominate person, geas

Flawless Firearm

At 1st level, your soul been imbued into a handgun, which
serves as your body. You retain any bonuses or features of
your race, and are still considered to be of that race and
type. You gain immunity to poison and disease, you do not
require food, air, or water, and you no longer age. You have
the same AC as your bearer, and you can use the higher of
your Dexterity modifiers to calculate their AC. Whenever your
bearer takes damage but you do not, both you and your bearer
take half the amount of damage instead. You can regain hit
points as though you were a living creature. Your walking
movement speed is 0, and can’t be increased.
As a soulbound firearm, you have the following properties:
You have a range of 60/120. Your attacks inflict 1d10 piercing
damage, and you require no ammunition to fire. You count
as a magical weapon for the purposes of overcoming damage
resistances and immunities, and grant proficiency with
firearms to your bearer. You are not considered a magical
weapon for the purposes of spells like elemental weapon.
Additionally, your spells’ somatic components are replaced
with “visual” components, where you visibly flare with
magical power. You count as an arcane focus. Your bearer
must have at least one hand touching you to enable you to
cast a spell that deals damage with a range other than “Self”
or “Touch”. The exceptions to this rule are eldritch blast and
firebolt, which you learn when you choose this patron.
You can communicate telepathically with your bearer, and
with any creature that speaks a language within 60 feet of you.
This telepathy is two-way, but otherwise you cannot speak.
If your bearer is unconscious, you can move their body and
control their actions, even when they are reduced to 0 hit
points. Each time they take damage or would otherwise be
awakened, you can choose to force them to make a Wisdom
saving throw against your warlock spell save DC. If they fail,
they don’t awaken.
Whenever your bearer makes a skill or ability check,
you can choose to make the check in their stead using your
statistics.
Your form is permanent, and you can’t be affected by Wild
Shape, polymorph, or any other spell that would change it.

Don't Even Blink

Starting at 6th level, you can shoot down other projectiles,
even magical ones. Whenever a successful ranged attack roll
is made against a creature within 30 feet of you, you can use
your reaction to shoot the projectile and steal its momentum,
reducing the damage it deals by 1d8 + your Charisma modifier.
You can use this feature a number of times equal to your
Charisma modifier, and these uses recover whenever you
finish a long rest.

Merciless Harvest

At 10th level, the true name of your soul is inscribed onto the
body of your weapon, and you learn to steal this name from
others. You gain resistance to radiant damage. Whenever you
kill a creature with an attack using yourself, you and your
wielder gain temporary hit points equal to the amount of
damage left over after the target was reduced to 0 hit points.

Execution and Redemption

At 14th level, the weapon that houses your soul is both a
prison and the key to escape. Whenever you are within 5 feet
of a prone humanoid creature, you can choose to fire a single
magically-infused round at them as an action. The target
must make a Charisma saving throw. If they fail, they take
10d10 force damage. If they die, you appear in their hand and
cannot be removed without your consent. They are considered
an unconscious creature that cannot awaken, and you can
control their body using your actions. Treat your statistics as
theirs, and your health as their own.
When dawn arrives, the body you’ve taken disintegrates
into dust and reforms into your firearm. You can do this once,
and can’t do so again until you finish a long rest.