Travel by Bifrost is supposed to be highly reliable.
Loki, inveterate faller, falls off it anyway.
"I'll have to look at it more closely, but if you give me I can figure out some of what it does. At a glance all I can tell is that there's something changing your physical form that feels like it's alien to you."
"I have no idea what that would be."
"Do you want me to try and figure it out?"
"...if you don't mind, yeah, I'm curious."
"You tried to help me, it seems fair. It's easier if I don't have normal senses though. Give me a few minutes?"
And he turns back into a rock.
Kyoya looks up from his work.
"Didn't work, and he thinks I'm enchanted somehow and he's looking into it."
"That's concerning. Sorry to be so distracted but there's something of a crisis-"
And he goes back to what he was doing.
After a few minutes, Lucian returns to being human.
"I think I've figured it out. I don't have all of the words I'd need to describe this. But the type of being you are now isn't what you would have been. I think this magic has been on you for a long time and changed how you grew. It's all physical I think and whatever you were originally isn't completely gone, it's still there underneath."
"Can you tell what I would have been?"
"I could, if I had the words, but I haven't seen a person of that species before so I'm not sure what to call it. I'm sorry."
"If I made an illusion of some species I've seen could you tell if it was one of those?"
"I think so."
She makes an illusion.
Various people from 'heims and 'gards.
He stops her when she makes a jotun.
"That one I believe."
"Thank you for letting me know."
"You're welcome. Thank you for trying to heal me. I hope this isn't terrible news for you."
"It's not great."
"I'm sorry. I would offer to undo it but the complexity is beyond me."
"I think that would be worse anyway, but thank you."
Kyoya shuts off his computer and comes over.
"I don't completely understand the significance of that, but, is there anything we can help with?"
"I don't think so."
"What does this mean to you?" he asks softly.