Soul homunculi are small constructs the size of a squirrel, that function something like a wizard’s familiar, but bear a greater resemblance to their creator than any beast. They appear as diminutive humanoids dressed like scholars, though their robes are thick and protective. They do not have an independent existence, but live as extensions of the soul of their creator. They are created by casting the soul homunculus spell.
Flesh and Blood Duplicates. The soul homunculus not only resembles its creator physically, but knows everything its creator knows, including all the langauges the creator can speak and read. It thinks of itself as a sage, and is driven to solve mysteries with alchemy or scholarship, preferably within the safe confines of its laboratory (see below). It has no larger goals beyond obeying its master’s will and discerning arcane secrets. Though it has no physical needs while its master is alive, it also likes to indulge in good food, beverages, and the like, though it enjoys them as luxuries rather than pursuing them actively. Generally, it likes the same cuisine and drinks as its creator, and it sleeps, breathes, and speaks much as its creator does, but it doesn’t actually require food, water, air, or sleep. In many ways, it is a very sophisticated yet small flesh golem, but made of alchemical ingredients rather than corpses and enlivened by a spark of its master’s essence.
Researching Constructs. Soul homunculi live in special bottles that contain tiny alchemical laboratories and libraries. The bottle is customarily carried or kept by the construct’s creator. The tiny demiplane within the bottle has its own gravity, remains a comfortable temperature, and maintains a pocket of breathable air. The interior of the bottle is generally unaffected by the world outside of it, and can only be entered by a soul homunculus, which changes size to fit inside of it. The wax stopper at the mouth of the bottle opens and closes like a door when the homunculus passes through it, but a magical field around the bottle allows nothing else to enter or leave.

Soul Homunculus

Tiny construct, lawful neutral

Armor Class 13 (natural armor, padded)

Hit Points 7 (2d4+2) 2d4+2

Speed 20ft

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STR

4 -3

DEX

13 +1

CON

12 +1

INT

14 +2

WIS

12 +1

CHA

9 -1

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Skills Arcana +4, Medicine +4, Perception +3, Stealth +3

Damage Vulnerabilities Fire

Damage Resistances necrotic, psychic; bludgeoning, piercing, and slashing from nonmagical attacks

Damage Immunities Lightning, poison

Condition Immunities charmed, exhaustion, poisoned, unconscious

Senses passive Perception 13

Languages Primordial, all languages known by its creator, telepathy 120 ft. (creator only)

Challenge 1/2 (100 XP)

At will: Innate Spellcasting. The soul homunculus’s innate spellcasting ability is Intelligence (spell save DC 12). It can innately cast the following spells, requiring no material components: At will: vicious mockery, detect magic, invisibility (self only)

Bottle Laboratory. The bottle which the soul homunculus calls home cannot be broken or destroyed while the creator of the construct is alive.
Grow/Shrink. When entering or leaving the bottle laboratory it calls home, the soul homunculus changes size. When entering the bottle, it shrinks down to one half of its normal height. When leaving the bottle, it resumes its normal size and appears in an unoccupied space adjacent to the bottle, or in a space occupied by its master (if the master is within 120 feet).
Sustaining Bond. As long as its creator is alive, the soul homunculus does not need to eat, sleep, breathe, or drink (though it likes to do all of those things as often as its creator does) and it regains 1 hit point at the start of its turn. If it takes fire damage, it doesn’t regain the hit point at the start of its next turn.

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Actions

Syringe. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 1 piercing damage and 1 poison damage, and the target must succeed on a DC 12 Constitution saving throw or be poisoned until the end of its next turn. If the saving throw fails by 5 or more, the target is instead poisoned for 1d4 minutes and unconscious while poisoned in this way.
Acid Vial. Ranged Weapon Attack: +3 to hit, range 15/30 ft., one target. Hit: 1 acid damage.
Enter/Exit Bottle Laboratory. As a bonus action, the soul homunculus enters or leaves the bottle laboratory.