Yunalesca was willing to teach Naruto many things, but she was reluctant to show him certain aspects of being a Summoner. One aspect they had to face together in the form of a Spirit.
Naruto was practicing with his sealing skills one day, having learned the basics from a Spirit that looked too much like Naruto for comfort, when Yahiko sensed a malevolent spirit nearby. He ran from Naruto's side to the edge of the clearing where he felt the presence. Yunalesca soon notes where the pup ran to and walked over to see what got the hound so spooked.
From between the trees came a Spirit overflowing with resentment and longing. He stood at about five foot three, dressed in Spiran clothes. On the back of his vest was the tell tale mark of Yevon so many Summoners and Guardians wore to remind them why they took the pilgrimage in the first place. Set on his face was an expression of pure malice as he looked upon a Summoner and the Fiend guarding him.
"What a Disgrace," The man growled, pulling a pair of Baghnakhs from his waist and getting into a fighting stance. "How dare a Summoner ally themselves with Fiends!" He roared before trying to strike at Yunalesca. The Spirit dodged with ease before kicking the spirit into a tree.
Yahiko ran to Naruto, pawing at his leg, "please make me big?" He is eyes asked before glancing at the spirit trying to stand back up. Naruto immediately reached out for the hound and cast Mini. Soon the hound went from the size of a puppy to a tiger sized nightmare hound. When Naruto pulled his hand away Yahiko leapt at the spirit, pinning them down to the ground.
Naruto ran up to Yunalesca and hid behind her; he looked at the enraged spirit in fear from behind her back. "Yu-Nee-Chan?" He asked, looking up at her, "What is he?"
Yunalesca set a hand in his head gently, saying, "that Naruto, is a Poltergeist. A malevolent spirit seeking revenge for a past wrong. They range from Murderers to angry Mothers." Naruto nodded, soaking up the information like a sponge. "This one looks like a Guardian though. His Summoner was probably killed before he died," she continued, gently petting her student's fluffy hair.
Naruto looked at the enraged spirit in surprise, wondering if someday his friend would be like that.
"All we can do is send him on his way," Yunalesca sighed. She summoned a simple staff into hand then gave it to Naruto. "You need to do a Sending," she instructed, "otherwise he will keep wandering and attacking Spirits and Fiends alike."
"There's nothing I can do?" Naruto asked, taking the staff in hand. He looked at the snarling spirit cautiously. Yet the only thing set on their face was Rage with despair hidden deep in their eyes. He reached out towards the spirit with a quivering hand. Yet once he was within arms length the Spirit slashed at the poor boy's hand!
Yunalesca immediately stomped on the Spirit's hand before pulling up Naruto's hand and wiped the wound off. She gently wrapped Naruto's hand in a cloth, cast in Regen on the wound. "It didn't Blight, so you'll be alright in a couple minutes," she said soothingly. Naruto nodded, looking up at Yunalesca nervously. "You have to send him on his way Naruto," Yunalesca said, gently petting Naruto's Head soothingly.
Naruto took one last look up at Yunalesca before nodding, taking the staff and running over to the small pond in the training area. He took a couple of tentative steps onto the water before his training and instincts kicked in… He began dancing across the water with the precise movements of long hours of practice. Yunalesca his behind a barrier with Yahiko as they watched Naruto soothe the soul of the Poltergeist.
For weeks afterwards Naruto has nightmares of Poltergeists…