Supreme Magus by Legion20

It's called character development. People change, especially over the course of decades.

So you just gonna compare Morok's father, who is an awakened bright violet core with over 300 years of magic usage to lith, who hasn't even being using magic for 20 years...

Lith barely got his proper bloodline abilities at blue core less than around 5 years ago ( and violet less than 3 years) and is still learning about his bloodline, while Morok's father mastered his hundreds of years ago.

Even Faluel and Morok's master barely managed to kill him, and both of them were awakened bright violet core elders with hundreds of years of experience too.

The fact that Lith managed to beat Syrook who had a superior core level than his own, while also being smaller in his beast form, (adult beast like Syrook at 30 meters tall, while Lith still 20 meters tall which) which means a couple tons of difference, is considered a HUGE accomplishment. That too, Solus had to kill Syrook's harbinger to weaken Syrook to kill him.

Still as Syrook said, Lith was younger, smaller and weaker than himself .... yet Lith still won.