Rudrabhishek Mantra is 11 verses stotram, chanted by Lord Krishna and Arjuna to please Lord Shiva and to get weapons from them.
Once in the battle of Mahabharata, Arjuna has taken a promise as either he kill Jayadratha or he will die. During the night, Lord Krishna takes Arjuna along in a dream, in the Kailasa whereby the inspiration of Lord Krishna, Arjuna chant Rudrabhishek mantra. As Lord Shiva is pleased by it, they give weapons to Arjuna.
Once in the battle of Mahabharata, Arjuna has taken a promise as either he kill Jayadratha or he will die. During the night, Lord Krishna takes Arjuna along in a dream, in the Kailasa whereby the inspiration of Lord Krishna, Arjuna chant Rudrabhishek mantra. As Lord Shiva is pleased by it, they give weapons to Arjuna.