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When Danny had his accident, he managed to keep the full extent of his powers a secret from everyone. He knew it was irrational, but what if Sam and Tucker agreed with his mom and dad about ghosts after seeing his ghost form?
More importantly; how could he ever let Sam and Tucker know that when they'd egged him on, at least a part of him had died? Neither of them would ever forgive themselves for it.
However, suppressing such a huge part of himself resulted in more accidents, and he had to at least concede that he was a meta. A strong one.
The powers that got leaked were; intangibility, flight, ecto-blasts, frost breath, invisibility, and tactile telekinesis disguised as enhanced strength.
That was, naturally, huge. Those were some dangerous powers, and his mom and dad wanted to make sure he got all the help he could.
They signed him up for a Big Brother program run by the Justice League, to put him into contact with another super-powered hero to provide guidance. To help him get used to his powers.
Maybe take him on a few training runs.
Danny let it happen, and kept his ghost form a secret from his mentor as well. He knew that if he went full ghost, the powers he was already displaying would be magnified, and that terrified him.
Danny didn't use his ghost form at all if he could help it. He didn't like the concept of what it was, didn't like that it stripped him of his humanity, didn't like how it felt just as natural to him as his human form. What if he got stuck one day?
What if he used his powers so much, that he died for real?
The potential strength of his own powers scared him so much that his mentor spotted it, and Danny told a very abridged version of why he was so delicate with his own powers; that he'd gotten them from dying. That all of them were a form of death magic. That if he leaned too far into them, would he lose himself?
He didn't know.
He didn't want to find out.
He couldn't bring himself to tell his mentor about his ghost form, not wanting them to grieve a person still very much there.
His mentor, while not agreeing with fearing what was a part of him, did agree to take it slow with their trainings, so as not to overwhelm the fourteen year old.
But superheroes lead turbulent lives.
Danny and his mentor are on a training trip, and one of the mentors villains shows up. But the villain has a new tactic; they have a way to deflect all of Danny and his mentor's abilities.
Or at least the villain thinks they do.
Danny realizes that if he wants to get out of this alive, then ironically, he's going to have to die.
"...I have to win, right? No matter the cost." Danny mutters, dragging himself up.
"No. No, whatever you're about to do, don't!"
Danny ignores his mentor and, with a bright flash of light, lets the cool calm of death wash over him.
Danny goes ghost, in front of his mentor.
Danny's mentor just watched the kid under their watch get consumed by the powers he'd so feared.