Re: Frigga's and Loki's tricks
Well in SOME instances Loki goes back in time to teach himself magic which WAS covered in the return of Thor run by jms.
In the comics, MAGIC is MAGIC. there aren't any over-Explained reasons why Magic Works just that it CAN be sensed by technology.
I would assume the Casket is back in the Asgardian Vault. Last we saw it was when Loki used it on Heimdall. I don't think it went into the abyss with Loki
Responsibility, Duty, Honor these are not
mere virtues to which we must aspire
they're Essential...to every soldier
....to every King.
Coulson, "If the details of this gets out, the operation would be complimized"