Point of order, unless Konsi has some arcane channelling abilities that most clerics don't, she's casting Quest. Mystery should be correcting her from off panel.
Oh, I'm just talking about the lineage of the rules systems, there isn't really a good concept of "changing something from 4th to 5th edition" because 5th edition comes from 3.5. 4th is an offshoot really.
It does make some sense to ditch "quest" I think - partly because the spell can be "don't do (x)" and that's not really much of a quest, and partly just for simplicity in rules.