"I know the rage that drives you. That impossible anger strangling the grief until the memory of your loved one is just... poison in your veins. And one day, you catch yourself wishing the people you loved had never existed, so you'd be spared your pain. I wasn't always here in the mountains..., once I had a wife... my great love. She was taken from me. Like you, I was forced to learn that there are those in this world without decency who must be fought without hesitation, without pity. Your anger gives you great power. But if you let it, it will destroy you... As it almost did me.''
~ The Raven (Eren Ovalheim) to Kirito VI Vollachia, epilogue to 'The Chronicles of Vollachia: The Lost Prince'.
Eren Ovalheim is a mysterious individual who was at the front of the resistance against the Mindflayer's infiltration of civilization 400 years ago. He had close ties to Interamnia, Krakos, and Kirito, but this was only apparent after the 400 year drift.