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.
That's the thing. Steam caught on in part because compared to physical retail "only" 30% was a massive improvement for the average game company. I've heard 60-70+% going to buying/printing floppies/CDs, packaging, distribution, etc. at the high end. I'm sure the big companies got bulk discounts or multi-year deals for supplies.
Yes that meant that since those aspects were a significant amount of the cost anyway you could do stuff like the StarCraft Battlechest that was crammed with extras. But it also did a lot of gatekeeping in it's own right.
Now you could probably do some kind of limited run thing that would be a lot more viable, but it's definitely a luxury step up.