Gale had prepared an entire room for Xiaolin's training. Since she was going to use Pure crystal, which was generally poisonous to anyone who wasn't Iron rank, it was all he could do, considering there were a two-year-old baby and his copper ranker mother living with them. Vale and Gale were totally fine with it, though.
Gale had laid a few formations in the room, sealing it from outside energy flow. That way, the radioactive waves of pure crystal wouldn't travel outside. Moreover, this room would have several times the energy and spirituality density of outside to get most Xiaolin's constitution.
"Master, I'm ready," Xiaolin said in her white sleeveless practitioner's robe.