Easiest way to describe abilities sometimes (it works like this spell).
There's also a huge resistance to allowing "superhuman" or "supernatural" effects in a non-spelled class, effectively gimping them at higher levels. However that tends to ignore that in many tales and myths non-spellcasters could do some pretty amazing things (Knights cleaving opponents in two with one stroke [equivilant to a Disintegrate spell], Beowulf swimming the English channel in a storm while wearing chain mail [Longstrider + Bear's Endurance spell], Wrassling bears, dragons and whatnot [Hold Person], jumping impossible gaps [Jump spell] and stuff that could easily be classified as spells of up to 4th level or so, but done "mundanely").