Arjun worships Indra and Shiva for Divyastra and gets Pashupatastra - S1.E52

After hearing about the Pandavas exile, Krishna goes to visit them. He advises the Pandavas to prepare for war and tells Arjun unwillingly to do penance to obtain divine weapons. Arjun does penance and eventually pleases Lord Shiva. Lord Shiva bestows him with the divine Pasupata weapon and advises him to obtain other weapons in Indralok. Rishi Durvasa visits Hastinapur. In an attempt to humiliate the Pandavas, Duryodhan requests that the sage visit that Pandavas as well. Rishi Durvasa promises to do so.