Timeframe, Season one, 'The Pack'.
Whether it was the angle of the blow, poorly made material, or some other weird aspect of fate; Buffy hitting him with the desk only momentarily stunned the Hyena possessed Xander Harris. Instead of being out cold, the young man in question chased Buffy out of the classroom.
Idea in her mind, Buffy led Xander down the halls to the Library, where Giles was.
“It's not Xander! Do something!” Buffy called as she ran through the swinging doors that were the entrance to the library from inside the school. Xander entered moments after her.
Reeling in self doubt as well as memories of possession gone wrong in his youth, Giles uttered a word he hadn't used in some time. One of the few spells he knew he could still pull off without much consequence. “SOMNUS” Giles said with a slight gesture at the boy, only to feel a throbbing in his forearm.
As Giles clutched his arm, Xander fell to the ground asleep.
“Whew! Thanks Giles. I hit him with a desk but it didn't take.” Buffy said as she grabbed Xander's feet. “Let's lock him up until we get him depossessed.”
Giles forced himself to stop holding his arm and got the keys for the book cage/weapons locker.
Xander had a pounding headache as he and the others left the zoo. Noises were to loud, lights were too bright, the smells. HE didn't know if this was an aftereffect of the hyena but he didn't like it.
Once he assured the two girls that he was okay, though he didn't really remember much of the whole ordeal, it was just him and Giles in the library.
“You know, none of the books mentioned anything about memory loss.” Giles said softly.
“I remember everything G-man. I really don't want to, but I do. It was terrible.” Xander said.
“Possessions typically are, even welcome ones.” Giles said as he rubbed his arm in thought.
“Are you okay Giles?” Xander asked him.
“This whole episode reminds me of a rather unpleasant time in my past Xander. Back when I was an idiot who thought he'd live forever. It took something quite tragic to change my views on that. I don't care to elaborate any further though.” Giles said as he cleaned his glasses.
“If you say so Giles. So are there any side effects from this that I need to worry about?” Xander asked him.
“None that I know of. As far as I can tell you're free of the primal spirit now. Why?” Giles wondered, his curiosity piqued.
“Just a headache.” Xander said. “I'm going home. I'll sleep it off.”
Giles nodded. “Do you want me to give you a ride? It is night out.”
“That would be a good idea, thanks Giles.” Xander said with a grin.
“Just don't expect me to make a habit of it. I'm not a chauffeur.” Giles told him.
Xander nodded, wincing in pain as he did so.
When Xander got home he found a package addressed to him on his bed. He didn't recognize the logo but he figured since it did have his name on it, including his middle initial, it was his.
He opened the box and found an envelope inside, the words 'read me first' on the front of it.
Xander opened the envelope and read the letter.
“Dearest Alexander,” It began.
“I write you this now, knowing you won't receive it until the time comes. I have known of you since the moment of your conception, and I was there when you were born. It still troubles me to this day, what I did to you, to your mother. However in all possible futures, it needed to be done.
In short young Alexander, I am known as Destiny. It is a codename yes, but a rather fitting one due to the fact that I am a seer. I have the gift of foresight. Most of the time it is only moments right before the present which allows me to navigate this world though I am physically blind.
However there are other times where I can see great deal further into the future. Sometimes it is just a scene, a picture. Other times it is much much more. I saw a great deal of potential in you young Alexander. One that would have been squandered and maligned by your true mother.
You Alexander, are what will be commonly referred to as a mutant. You have always been a mutant. Unlike some who possess the gene that can grant them abilities should it activate, yours was active since you were a zygote. You were conceived and born in less than a twelve hour time span. If I didn't have a magic user seal off your mutation, you would have reached full maturity in the space of a week. That is no way for anyone to live. Your mother is a dear friend of mine but she and your father are not what would you consider to be 'good people' by any account. They would have turned you into a mindless weapon. A tool. I couldn't allow that future to happen.
As of right now, the magic sealing off your mutation has only been weakened, allowing a few of your gifts to become active. All five of your senses have been heightened to an incredible degree. It will take some getting used to but you will manage in a short period of time. Along with theses you also have two other notable changes. Your body now heals itself at a much faster rate than it did before. That ability will only grow with time. I suggest you use it to your full advantage. The last change is the claws. They are smaller than some I've seen, but useful nonetheless.
I am truly sorry this had to be this way, but it was necessary. Your adopted parents believe you to be their biological son. There is magic at work there, don't try to break it. It won't end well if you do. As for your friends, I only ask you keep your mutation a secret until you feel it necessary to reveal it to them. They care for you Alexander. Trust in them.
Enclosed in this box are a few books that will help you center yourself, which in turn, should let you have a better handle on things in the future. I've found that half hour's meditation a day tends to keep one clearheaded.
Your almost godmother,
Xander set the letter down. This was a lot to take in.
He looked at his hands, really looked at them. He felt something /shift/ inside them then... “Ow...ow ow... damn that hurts.” he half screamed.
From the tips of each of his fingers were dark black claws, each about an inch in length.
“Great, now all I need is a scratching post.” He muttered
He looked back at the letter. “Well, she's not wrong so far.” he said with a wince as the claws went back into his fingers. The skin closed up after them.
“Oh, crap.” He said softly while staring at the droplets of blood on his fingertips.