Kina was a powerful entity imprisoned beneath the Fortress With No Name for millennia. She was worshiped as the goddess of death in Taglios and elsewhere in the Southern Continent, and a wide variety of myths attempt to explain her existence. Constantly planning her return, she mentally reached out to countless individuals across many or all of the 16 worlds linked by the Plain of Glittering Stone.
In the homeworld, her worshipers were called Stranglers or Deceivers. Membership in her cult was forbidden there, punishable by execution, as it centered around human sacrifice. Additionally, the Free Companies of Khatovar (of which the Black Company was one of the last) were actually created by Kina's servants in a different world, Khatovar, and were sent out to choose the location of her return during the prophesied Year of the Skulls.
Kina appeared alternatively as a beautiful woman with perfect proportions, sleeping naked but covered in scars; or in other circumstances, a hideous demon. In the dreams that Murgen and Lady had about her, she appeared as a colossus with four arms and demonic face.
Kina's "Foretold" messiah was the Daughter of Night, who was protected by Narayan Singh, the living saint of her cult. They both worked tirelessly to transcribe the Books of the Dead to bring about the Year of the Skulls. Kina was able to project her power in physical form outside her subterranean tomb only rarely, and apparently at great expense. In She Is The Darkness, she manifested physically in Longshadow's uppermost tower in Overlook. There, she encased the Daughter in a protective "eggplant black" magic bubble; she also effortlessly swatted Soulcatcher and the Howler aside, wounding the powerful sorcerers seriously.
Kina, in her genuine physical form, was wounded gravely by Goblin, who pierced her with the Lance of Passion at the end of Water Sleeps. She used this event as an opportunity, however, and sent out a loyal demon, the Khadidas, from her nostril to take possession of Goblin's body. In Soldiers Live, the Khadidas, disguised inside Goblin's body, escaped with the Daughter and attempted to transcribe the Books of the Dead in the homeworld. They failed, and were eventually recaptured by the Black Company inside the Palace of Taglios. The Khadidas was suppressed with the aid of the complex of spells inside One-Eye's hat. Kina was soon attacked in her chamber again by Goblin, who pierced her skull with One-Eye's spear. An instant later, she was disintegrated by Croaker when he detonated Goblin's rheitgeistiden. Her evil influence was finally wiped out from all 16 worlds. Even in the Grove of Doom, the goddess's overhanging sense of psychic menace, which had hung in the air of that place for centuries, was gone at last.