Aella and Mira walked into the cavern where Arad's egg was resting. They could see it on top of a mountain of gold, gems, and jewelry, pulsing with magic.
The room keeps changing. Each time they walk in, new things grow, and the older ones grow larger.
BA-DUMP! They could hear the egg throbbing like a heart, emitting a faint purple glow as it discharged mana into the room that later condensed as pure mana crystals on the walls, ceiling, and ground, dangling and protruding down like stalactites and stalagmites.
Mira gasped, taking a step back. "Sorry, almost forgot," Aella waved her hand around her, engulfing her in a ball of wind magic, "Better?"
"Yeah, thanks,"
Arad's egg constantly absorbed air from the cavern, dropping the pressure and oxygen concentration a lot, and on top of that, the discharged mana fills the air and overwhelms anyone who isn't used to it.
It's now a chess game between Roberta's team and the devil's team, trying to see who outsmart the other.