Which is why it's bad writing.
"Unblockable killing spell" is the kind of thing that pops up on a middle school playground because every kid wants to have the trump card in make-believe and the last kid just cast Meteor.
Eragon is a contemporary-ish book and has killing magic that can kill normies by the dozens/hundreds, but other magic users have to do more than play rock-paper-nuclear-option.
The newer ender printers are definitely less drama than the older ones. Unless you go higher end with them where they have bed leveling and more sensors I'd recommend something more plug and play.
Big fan of Prusa.