Meaning of Mana Conversion

In the Gayen Household, the television in the living room was streaming the live situation in the Wild Willows. Samar and Stivi's parents sat on the sofa, their hands clenched from anxiety and worry. 

They watched as Samar, Stivi, and the rest of the team scurried to dodge the golden fire ball launched by the Sun Scarab. The team was in a sorry state, with burn marks all over their body, but fortunately, their HP's were still over 80%, not that it mattered. 

"Foolish kids! Why would they leave a powerful guild like the Grandeur?"

Ellie, Stivi's mother, voiced her dissatisfaction as she saw Stivi narrowly dodge another golden fireball from the Sun Scarab. 

"Had they stayed in the Grandeur, they could've been inside the Scarab instead of running away from it."