Symbiosis
From Inga no Kusari wiki
Symbiosis is Sachiko Haribou's Fullbring.
Symbiosis has no visual indication when it activates, however, when it does, Sachiko’s personality changes and her reiatsu becomes heavily tainted like that of a hollow.
Fullbring Abilities
Symbiosis is not a true fullbring and does not represent some hidden power within Sachiko. It instead represent the mental, physical, and spiritual merging of Sachiko and her inner hollow, Vacia. By becoming one with Vacia, Sachiko has begun to walk the fine line between human and hollow. This grants her a few benefits exclusive to hollow while allowing her to retain her humanity and mortal flesh. She gains the natural ability to use cero without donning her mask as well as the ability to utilize Pesquisa, a hollow’s sixth sense that allows them to detect reiatsu. Sachiko is also capable of gaining skills and abilities exclusive only to arrancar, however, unlike the two previous bonuses, these will take time and effort to develop.
Symbiosis also grants Sachiko the unique ability to detect any external container powers (Zanpakutō/Visored/Resurrección) an individual might possess. When in use, this ability replaces her sense of smell and allows her to detect the aroma given off by any individual in possession of an external container power. Sachiko is unable to determine the nature of any powers through the use of this ability, however, the more powerful the external container, the more enticing the aroma.
As Sachiko grows stronger she is able to delve deeper into the powers of a hollow. Unfortunately these benefits do not come without their price. Having merged with her inner hollow, Sachiko has sacrificed her individuality. Her personality is now a mixture between her and her inner hollow, though she remains the dominant of the two until she dons her mask. Her soul has also suffered a terrible price by becoming more like a hollow. Her abilities as a mortal have weakened making her incapable of obtaining any fullbring not part of the Immortal Soul tree. Her reiatsu has become corrupt and emit’s a powerful taint like that of a hollow. As Sachiko delves deeper into her hollow powers her body will experience unpredictable changes.
Strengths
Access: Sachiko gains the ability to purchase all arrancar skills and abilities with the exception of resurrección, dormir, and alzado.
Perks: Sachiko is now able to detect reiatsu like a hollow and use cero without donning her mask. She also gains the ability to detect external container powers. (Zanpakutō/Visored/Resurrección)
We are One: Symbiosis is not a normal fullbring and the merging of Sachiko and Vacia is absolute, not even death can separate the two. This makes this fullbring immune to any negation powers, however, the skills and abilities it grants may still be affected.
Weaknesses
Inhuman: By walking the fine line between human and hollow, Sachiko’s human soul has weakened. She is now unable to awaken any fullbring not relating to Immortal Soul.
Corruption: In order to obtain the powers of a hollow, Sachiko was forced to sacrifice her individuality. Her personality is now a mixture between her and her inner hollow. Unfortunately that was not all that was sacrificed. Her reiatsu, her very essence, has become heavily tainted by that of a hollow making her more of a target for anti-hollow fanatics.
OOC: All arrancar skills and abilities must be purchased normally.
