"Mid-level Valkyries' Silhouette Weapon's Attacks" 

The Valkyries thought the white tiger would be the one fighting them because she could open a little crack to Hell, and they didn't know whether she could still do more. 

Who would have thoughts that the little tiger would step back and a seven-headed legendary snake would come out on her behalf?

The Valkyries weren't ignorant and immediately recognised Hydra as the famous legendary beast in legends. 

It was just that...this snake didn't live in the same dimension as them, which meant they had never fought each other at all. 

The mid-level Valkyries had also met many 'legendary beasts', but most were in lower-level worlds or dimensions. 

Such as the legendary beast in this world they visited through an illegal channel. 

The legendary beasts here weren't the original at all and were just the descendants who inherited the original beast's bloodline.