The Flame That Marched Against the Sea is a potent essence-infused mixture created using the Celestial Phoenix Cauldron. It creates a potent Holy-aspected flame and ignites specifically on contact with water. Alternately, the mixture may be mixed with normal firedust, creating a thick paste which may be used in a flame cannon or smaller piece of flame weaponry. This causes it to burn golden and spread its power to the body of anything caught by the flame, effectively causing the weapon to deal Holy damage.