Soul Calming Stone

"Rachel, Sophia does anyone of you know energy Isolation formation?" I asked. I know many formations including the common Isolation formation but I do know the energy Isolation formation as it is not only high-level formation but also requires basic mastery in the art of runic formations.

"I do," Rachel answered.

"Why do you need Energy Isolation formation?" I asked Rachel, "Can you draw it across the whole training room." I said dodging the question which made of the girls glower at me.

I thought Rachel will not draw the formation before knowing why but to my surprise Rachel just glower at me for a few seconds before she started drawing the formation. 

It took her fifteen minuits draw the formation and the formation she had drawn is flawless, no mistakes could be seen in it.