I blame protags and their confusing powers. For the record I figured anything not discussed in brainstorming was nerfed, just so you don't think I was trying to waltz in with anything absurdly snazzy! And hopefully, I didn't misunderstand what you were asking for, but:

Abilities

2 MAJORS: Alf Seidr or Elf Magic is the source of Magnus' two main abilities: healing and disarming.

Healing is the one we see Magnus do the most. He has to physically touch the person, and he glows when he does so and for a time after. He's a human flashlight. His own wounds heal fast, as well. He's not all-powerful healer dude, though, as mortal wounds (or magically mortal wounds) are beyond him. It's also strongly hinted that he has the ability to heal mental wounding as well, by looking people in the eye-- such as an ever-depressed goat who forgets to hate life when he looks at Magnus' pretty eyes, or when he stops a friend from having a complete mental breakdown at the reveal of the mythological world. In game Magnus' healing/glowing powers are now the effects of implanted nanotech with similar effects but a stronger drain on his own energy, as well as mostly regulated to surface wounds.

Disarment or the Peace of Frey is sort of his last resort special skill, and disarms all surrounding foes of their weapons, because Frey is a peaceful god, damn it. In game, his disarming is now just a neat device that blocks out electrical weapons such as laser weapons, programmable matter.

MINOR: Photokinesis and Thermokinesis, limitedly able to generate sunlight and warmth as his dad is the god of summer. Nerfed. I mean, he can use a flashlight like a normal dude,

MINOR: Geokinesis, of some vague limited sort. He literally collapses an underground ceiling to let in sunlight, one time. Likely this is only related to letting in sunlight. Nerfed.

PASSIVE: Temperature insensitive. As Frey is all about balance, including in weather, Magnus has an insensitivity to harsh heat or harsh cold. He's able to hold a lit match under his palm, and sleep outside in a Boston winter. He is not, however, able to withstand molten metal to the gut. In game this is brought down to normal range, where he isn't as affected by heat or cold but should definitely not try to walk through fire or sleep in a snowbank.

MINOR: Portal manipulation. As his world involved the Nine Worlds, there's a lot of jumping through magic portals and Magnus has the ability to sense which one is the one he wants without knowing where they lead. He's also capable of opening portals, with Jack the sword at least, and dispelling them. Nerfed.

MINOR: Telepathy... sort of? This is another "he did this once in the second book, and I have no idea why" power like geokinesis. He was capable of reading the minds of fish in an emptied pond to find a dwarf masquerading as a fish. Nerfed.

PASSIVE: As an Einherji (dead viking warrior) Magnus gets a few cool perks: enhanced strength, enhanced agility, and immortality. The first two are self-explanatory (he can jump off buildings and rip up street lamps), but the third is only within Hotel Valhalla. He gets killed there, he wakes up in his hotel room. He gets killed anywhere else, he's extra dead whoops. And doesn't age. In game Magnus' strength and agility are a part of the nanotech that gives him his healing power, as a part of a physical endurance upgrade.

SKILL: Thanks to his outdoorsy mom, Magnus has a lot of practice in wilderness survival.

SKILL: He knows ASL-- Alf Sign Language, which is either the same or nothing like American Sign Language, uh.

And I didn't know how long of a thread would be appropriate, so a sample:

And next time, maybe avoid getting knifed. Just a thought. [ magnus finished cauterizing the long, but shallow wound on the man's arm. he could have healed it so it leave even a mark, but magnus had learned to discern which wounds needed healing and which could be fine with medicine or a useful gadget. particularly when caring for a patient in the middle of a westerley bar, where some people might be more than interested in a medic with nanotech like that.

the killjoy, whose name magnus had already forgotten, shuffled off with a muttering that sure, yeah, he'd avoid warrants attacking him, super easy. with that taken care of, he started to repack his travel kit of medical supplies. he was pretty sure he was supposed to meet his sister back at their ship an hour ago, so there was a fifty/fifty chance he'd be the one in need of medical attention when he finally did make it there.

then the downside to doing a medic-run in a seedy westerley bar walked in: a shitty person who liked ruining people's days, specifically his. this shitty person, to be exact, was someone running from the company guns. with a knife in hand. presumably because they were stupid.

magnus watched as they grabbed the most well-dressed patron of the bar within reach (which was, thankfully, not magnus who blended in with the westerlyns better than one would expect) and held that knife to their throat. the fellow seemed to think the company would care if he had a hostage, which was rather unfortunate for all involved. aaand now the killjoy magnus had patched up seemed to this was a great warrant to take on, since he was already here. gee, a great idea. he pulled a gun on the knife-having hostage-taker and magnus whispered an Oh, shit to himself.

this was going to go poorly. magnus hurriedly shoved his supplies away in a disorderly fashion, much to his dismay, and hopped up onto the bar. he dropped behind it just before all hell broke loose. the company must have been royally pissed, given that they'd slapped a warrant on the guy and were still bursting through the doors with guns blazing. there was shouting, yelling, calls for order and surrender, and then blasts of guns. he was really regretting not heading for port long before now. he could have been safely aboard the pallas with his sister instead of in the midst of a bar shoot-out.

someone from the company tumbled over the bar into magnus' hiding spot, but with a wide space away from magnus. the man was clutching a neckwound that appeared to be bleeding profusely. the smart thing for magnus to do would be to stay put, and let the man bleed out. magnus rarely did the smart thing.

he found himself at the man's side without really thinking. the man pointed the gun clutched in his other hand at magnus wildly. magnus easily took it from him, tossing it aside. ] Hey, haven't you ever heard the phrase "don't shoot the medic"?

[ the wound was bad. magnus supposed if he was going to make one poor decision, he may as well make two. he pressed one hand on it, focusing on the wound. it just needed to be closed, the bleeding stopped. anything else was not his job, this was just him being courteous. even though the energy to close a wound like this would nearly knock himself out. he hoped random company guy appreciated it, at least. and that his sister wouldn't yell at him for it later. ]