In a large room of an inn, Jacob was closely examining the twin swords, but there was nothing extraordinary about them. He even tried all types of mana, spirit, and aura; he even dripped his blood on them, but these swords are just like any typical epic sword.
To measure a magic weapon's rank was very easy and depended on two factors.
First, mana channeling; one just needed to see how much magic power a weapon can channel without bursting. Every time someone goes through a rank evolution, their mana would also go through a qualitative change.
A rare magic weapon can only handle rare quality mana, while some weapons made with extremely resilient materials can endure a bit higher level of mana.
Although these twin swords were only epic rank, they could still channel mana, spirit, and even aura, which made them, indeed, somewhat extraordinary.
But what made them epic was the second factor, which was even more important than mana channeling, Weapon Emanation!