In J. R. R. Tolkien's legendarium, the Battle of the Black Gate is a fictional event that took place at the end of the War of the Ring. This was the final major battle against Sauron in the War of the Ring, fought at the Black Gate of Mordor.
Mordor actually has two meanings: The Black Land or The Dark Land in Tolkien's contrived language Sindarin, and The Land of Shadow in Quenya. Mordor, One does not simply walk into it. Storming Mordor is a pretty big challenge because it involves the use of many moves and those move poses great risks for losing the game. Storming Mordor is going to be a rollercoaster ride of passion and adventure with an environment to challenge your own limitations.