The Forerunner-Prothean War was the name of a brutal ten thousand year conflict that was fought between the Forerunner Ecumene and the Holy Prothean Empire that occurred in 120 Centrillion BNE. Although the true reasons for the conflict is not known, but, based on a number of archives given by the Second Human Empire, the war was started when the Forerunner Ecumene started to invade Holy Prothean Imperial Space, after thousands of years of tensions between the two, this ultimately turned into a long, bloody and brutal conflict that killed an unknown number of Forerunners and Protheans. the war ended in a tense peace treaty between the two at it's ten thousandth mark, thus putting an end to the bloodbath that was the war.

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