Second Great War

"The Sangheili have turned against us, and they have allied with the Humans! This is Truly the greatest herecy, and we shall burn their planets, destroy their fleets, and, most importantly of all, cleanse the land of their civilization, for they are in the way of initiating the Great Journey." -New Prophet of Truth, self-proclaimed leader of the Covenant "The humans have erected a new ship, one that has contested our Carriers. It can destroy our Cruisers in minutes, and it seems as if it was created by the Forerunner themselves. Only the Sacred Vessel can destroy it, but it is vastly outnumbered. Commander, the Great Journey is the only option." -Anonymous New Covenant Jirahlnae, referring to the Reach-class Superbattleship

Background
The Second Great War was equally, if not more devastating that the Human-Covenant War, a.k.a. the First Great War. The conflict's roots are traced to when the New Prophet of Truth, son of the Prophet of Truth, claimed the Covenant throne. He was a strong believer that the Forerunner meant for the Covenant to modify and improve their technology that they had left for them. This enraged billions of followers, and the Covenant then split, forming the Old Covenant, the believers of non-modification, and the New Covenant, the followers of the New Prophet. The New Covenant

Beginning (2580-2584)
The war began when Old Covenant forces assaulted Rebourne Prosperity, the under-construction successor to High Charity with a force of over 3