Quest spells were one of those things from 2e that just never seemed to make it futher, but if someone had one you knew there was a story behind it. That sort of narrative driven implication is the focus of 5e and so it makes sense to bring these truely epic spells back from yesteryear.
The spells presented are all updated representations of the 2nd edition ones from Tome of Magic, minus three spells that already basically exist in 5e.
I can't wait to hand one of these puppies out as a reward to my table's cleric (once they've earned it, of course).
[5 of 5 Stars!]