Each year, thousands of devotees from across India and even abroad flock to the world-renowned festival of Dev Deepawali, also known as Kartik Poornima. Varanasi celebrates Dev Deepawali 15 days after Diwali on the full moon in the Hindu month of Kartika, which falls 15 days after Diwali. Tripurasura was killed by Lord Shiva on this day as he was in the form of Tripurantaka. Besides marking Lord Shiva's victory over demon Tripurasur, the celebration also honors Lord Kartik, son of Lord Shiva and a powerful warrior. In Varanasi, Dev Diwali is also the last day of Ganga Mahotsav, a festival that's particularly popular with tourists. It is an auspicious day during which devotees take a holy dip in the Ganges River and light earthen lamps called Diyas during the dusk of Kartik Purnima. There are millions of earthen lamps illuminating the steps of the Ganges Ghats. There are millions of lanterns in all temples in Benares as well.