Goddess Thwaritha Devi is one among the numerous name of Goddess Parvati. She is known as Goddess Twaritha Parameshwari as she appeals to Shiva to answer the prayers of her devotees. She implores Shiva to give boons to his ardent devotees.
The story of Goddess Thwaritha Devi is associated with the Arjuna attempting to gain Pashupatastra from Shiva.
To get Pashupatastra from Shiva, Arjuna performed intense penance. Shiva wanted to make sure that Arjuna was eligible to receive the divine astra. Shiva took the form of a Kirata (hunter) and Goddess Parvati took the form of Kirati (wife of hunter) and approached Arjuna.
Arjuna was doing his Tapas, standing on the toe of his right foot; hands raised high above his head in pranamam posture and with air as his only sustenance, and chanting mantras to appease Shiva. Shiva realized that ego of Arjuna was causing hindrance to him possessing Pashupatastra. Bhagavan decided to wean out the go. Goddess Parvathi Devi, knowing well the strength and temperament of both, was apprehensive.
Suddenly a wild boar attacked Arjuna. The agile warrior in Arjuna awoke in split of a second and shot an arrow at the wild boar. The very same moment Kiratha also shot an arrow at the wild boar. Kiratha claimed that it was his arrow that killed the boar. Arjuna with disdain replied that it was his arrow that killed the boar.
The argument went into abuse and finally both decided to settle the argument with a fight.
A terrible fight ensued between the two with none giving any quarter. Goddess Parvati was worried at the ferocity of the fight.
She realized that if Shiva took his real form there would be no force in the universe that could withstand His wrath. So, Goddess Parvati started converting the arrows of Shiva into flowers.
Soon Arjuna realized that the Kiratha and Kirati are not human beings. Arjuna started showering flowers on Shiva with is arrows. Shiva was finally covered in a mountain of flowers.
Filled with remorse and deep anguish, Arjuna prostrated at the feet of his beloved Bhagavan, washing his feet with tears, begging forgiveness. Shiva, on his part was so moved with his favourite disciple’s absolute devotion, valour and remorse that he embraced Arjuna. Then Shiva as Pashupati imparted the knowledge of the great Pashupatastra to Arjuna.
Since Goddess Parvathi kept imploring Shiva to stop fighting and to grand Arjuna the boons that he deserves, she came to be called as Twarita Devi or One who prompts Shiva to bestow boons easily to whoever worships Shiva with utmost humility and devotion.