Rosa stood in the bathroom doorway with her arms crossed while Eren held the dungeon fragment in his right hand and waited.
"So this marble is a magical energy battery." Rosa said with no amusement.
She didn't believe it. Eren could hear it in her voice.
"It stores mana which is an energy from the other side but unlike the usual game mp concept. It is more like water or air to that world." He was saying but Rosa surprised him with her lack of game knowledge.
"Games?"
Eren had to spent half a minute to explain what mana represented in their gaming/fantasy culture. Then he continued his earlier explanation. "Anyways, I used all of my mana while getting here so I need to absorb enough to open the portal again.
"And that takes how long?"
"Every 100 mana between universes make it stay for one second. And my total pool is around 550."
"I was asking how long it will take you to use that thing?" She was getting more into learning things as time passes.
