Alaric's resolve wasn't anything new. It was the same resolve he had formed 100,000 years ago before his first clash with the Nox Demigod.
If anything, rather than fade with time, his determination grew as it festered for 100,000 years.
In truth, his desire to live had weakened too much. At this point, death was his wish. Whenever he thought about living in this world where generations had passed and the era had changed, he couldn't find it in himself to live on.
He knew nobody, he knew nothing. Although he was aware that another war with the Nox was on the horizon, he wanted to be selfish just this once. After living a life where he constantly sacrificed himself for others, he wanted to be allowed at least this much.
So without hesitation, he burned his life and turned it into essence to promote his attacks to a whole new level. When compared to when a 4th class did the same thing, a Demigod burning their life essence had a totally different meaning.