The Vishti karana, called Bhadra

a birth, or the timing of any undertaking, falling in the Vishti karana, the seventh and only inauspicious of the seven movable karanas

What the tradition reads

Vishti is the seventh and last of the seven movable karanas, closing the eightfold cycle that opens with Bava, and it is the one karana every source consulted marks as unfit for auspicious work. It is more commonly known by its other name, Bhadra, and onesanatan.com describes it as carrying fierce, destructive energy, warning that any peaceful or constructive undertaking begun during it faces obstacles or outright failure; the same source excepts one use, naming it good for overcoming enemies or for a competitive task, where its harshness works in the actor's favour rather than against them. Astrosight.ai lists weddings, business launches, housewarmings, religious ceremonies, financial transactions, contracts and travel for important purposes as the activities Vishti disfavours, a list that covers most of what a panchanga is consulted to schedule in the first place. Astrobelief.com's animal reading gives Vishti the hen, and reads a native of the karana as distrustful and inclined toward destructive or even immoral conduct, the harshest character given to any of the eleven karanas in that source.

The story

Astrosight.ai names Vishti's presiding figure as Bhadra, a daughter of Surya the Sun and sister of Yama, the god of death, and describes her as fierce and destructive by nature, the source given for why the whole karana carries her name and her temper. Wikipedia's article on Shani records that Shani too is a child of Surya, born of Surya's wife Chhaya, so a sister sharing that same solar and shadowed parentage sits comfortably within the wider family the tradition already gives the Sun, siblings who between them govern misfortune, delay and death rather than the Sun's own light. Where Bava opens the movable cycle as a figure of steady dignity, Bhadra closes it as its harshest turn, and the tradition reads her nature as a gift for one purpose only, working against an enemy in a fight already begun, while withholding it from every undertaking meant to build, bind or begin something meant to last.

Written from

Corpus key karana:Vishti.