Shiva Swallowing the Lethal Halahala Poison
During the great churning of the Ocean of Milk by gods and demons, a lethal poison called Halahala emerged that threatened to destroy all of creation. To save the universe, Lord Shiva consumed the toxin, holding it in his throat where it turned his skin blue. This act of ultimate sacrifice established Shiva as Neelakantha, the Blue-Throated Savior.