Series Skill Resonance
As always, the fire spirit's words were scarce but Evan was able to get the general picture of the situation from them
While increasing their movement speed as they headed outside the dungeon, Evan asked Amy and Eliza a few more questions and was able to come to a conjecture.
After confirming with Amy and Eliza that their skills were currently stronger and more potent than normal, he and Pride instantly understood what was going on.
"Series Skill Resonance."
That was the phenomenon that both Eliza and Amy had been experiencing.
When two users of unique skills from the same series were together, their skills resonated and became more powerful than normal.
The more wielders of the series were present, the more powerful the resonance.,
This was part of the reason why the previous seven heroes fought together a lot. Their skills resonated with each other and became many times more powerful when they were together.