Hod Rumnt, better known as the Prophet of Mercy, was born in 2332 on High Charity. Prior to becoming a high prophet, He served as Philologist on the Forerunner Dreadnought. Mercy and the other high prophets were instrumental in starting the war with humanity in 2525, and continued to push for their destruction through the following decades. Mercy tended to stay in the background for most of the Human-Covenant War, and did not get involved in direct combat operations.
After the Prophet of Regret started the Battle for Earth in 2552, the Prophets of Truth and Mercy became involved in the punishment of Regret and the start of the Great Schism on Delta Halo. Though Mercy sided with Truth throughout, he was abandoned just prior to their departure for Earth, and left to die at the hands of the Flood.