Shiva Purana
पद्मा पद्मावती भीता भीमा भीषणनायिका ॥ कराला विकराला च वज्राविंशतिमा स्मृता ॥ २१॥
Padma Padmavati Bhita Bhima Bhishananayaka The twenty-first of the thunderbolts is called Karala and Vikarala.
english translation
padmA padmAvatI bhItA bhImA bhISaNanAyikA ॥ karAlA vikarAlA ca vajrAviMzatimA smRtA ॥ 21॥
hk transliteration by Sanscript