Doll

are the primary weapons of the Bount.

Overview
A Doll is a representation of the power within a Bount, similar in concept to a Zanpakutō representing the physical manifestation of a Shinigami's power; this is due to the accident that created the Bount using Shinigami Souls as a template for the Artificial Souls which eventually became the Bount. Initially, all Dolls are dormant inside their Bount and can only be summoned and controlled when a Bount is ready to wield the power of their Doll. When not in use or in combat, Doll are usually sealed within a specific object known as a  which is often unique to the individual Bount wielding it, just like the Doll  itself; to summon their Doll, a Bount calls out the phrase , followed by the name of their Doll.

A Bount and their Doll generally have a master-servant relationship, but this is almost always tenuous with no strong bond between the two; if a newly-summoned Doll senses that its Bount master is not strong enough to wield its power, then it will turn on the Bount and kill them. Also, if a Bount is severely injured or weakened during a battle, their Doll can turn on the Bount and destroy both of them. This can also occur if the Doll is injured enough in battle, which will cause them to go berserk and attack their master while no longer listening to the latter's orders. When the crest of a Doll is destroyed, it can kill both the Doll  and the Bount that controls it; in the case of Hō and Ban, who simultaneously controlled the identical Dolls of Guhl and Günther, Ban being knocked out prevented Hō from fully controlling his Doll, who stopped responding to some of his commands. However, some Bount and their Dolls, like Yoshino Sōma and Goethe, have developed a deeper level of respect for each other than most do, such that even when either party is severely injured or the Doll crest is broken, the two will remain loyal to one other and continue to fight alongside each other. Additionally, when a Bount consumes a living Soul, their Doll gains a power increase exponentially greater than their own.

Sufficiently powerful Bount can merge with their Dolls, which causes the Bount crest to form on their own bodies instead of a separate object; doing so drastically changes the appearance of a Bount, primarily their hair and eye colors, but also greatly enhances the power of both the Bount and their Doll by creating a stronger being. While many Dolls are dormant in their sealed state, some, like Gesell and Baura, are never fully sealed by their Bount and provide functions outside of combat like transportation and surveillance. Most Dolls act and attack independently of their Bount, who usually issue commands to them, but some can transform themselves into weapons and shields that can be wielded by their masters in combat while others exist as specialized weapons and must rely on their Bount to wield them in combat or initiate any special abilities that they may possess, though they still retain some control over their functions. Non-weapon Dolls take various shapes and sizes, ranging from small rodent-like creatures to enormous humanoids.

There are multiple ways to summon a Doll; some Bount are naturally strong enough to summon their Doll without any aid from outside sources. Additionally, though the creation of the Bount was an accident, Ran'Tao's study of them and their inherent abilities allowed her to develop an amulet-like device that can be used to both draw out the dormant power of a Bount or channel their active power into the user's body. Jin Kariya, who was already recognized as a child prodigy within Bount society, unconsciously used the amulet that Ran'Tao gave him to simultaneously summon his Doll, Messer, and fuse it to himself, greatly enhancing his body and allowing him to use its powers without releasing it first.

After resolving to take revenge on Soul Society, Kariya decided to find another way to summon Dolls for Bount who could not do so naturally and enlisted the help of Ugaki to spend years developing a ritual that would allow a Bount to summon a Doll on their own if they felt ready. The ritual requires the use of a table emblazoned with a Bount emblem and a large candle surrounded by six smaller candles as a point of focus, where the Bount must carefully lay out small portions of sulfur, phosphorus, carbon, water, fat, magnesium, and lime before reciting a chant known as the Zauberspruch für die Ladung to complete the ritual. Following this, the Doll is born within the flames of the center candle before being fully summoned into the world, where it can initially be tired and desire rest.

Bitto
are a unique form of Doll created by Jin Kariya and Ugaki. They are large, mosquito-like beings which drain the Souls of Humans and condense the energy into a purified elixir, which takes the form of a glowing orange liquid, for the Bount to drink from a small vial stored in their lower bodies. After the soul elixir has been ingested, the Bount who took it immediately experiences the empowering effects of consuming a living Human Soul, with veins popping from their skin and their mouths stretching into ecstatic smiles; according to Kariya, this method empowers them even more than consuming Souls normally does due to how purified the contents of the Bitto are. However, should the liquid be left unconsumed, the Soul comprising it turns rancid and becomes poisonous, allowing it to be used against the enemies of the Bount by throwing the inert Bitto into their bodies stinger-first like a dagger. Kariya created the Bitto by sacrificing Yoshino Sōma, the only Bount able to reproduce, in an elaborate ritual that produced a large swarm of them.