There is no forgiveness.
Brother Thomas was a devout monk to the order. When he realised that the onslaught of Armageddon was not of a biblical sense but that of a heathen belief, he took his own life. Ragnarokk destroyed his faith in God as well as in humanity. The anger he still feels in his afterlife has led him to join forces with the other entities to prevent you from accomplishing your mission.
Can you stop Brother Thomas?