Not that im disagreeing with you Demon but i'm under the impression that runic knight's damage will be more spell blade style (mystic knight FFV style) so its not exactly en spells... on the other side of things though you could probably view these as Enspell 3 with a different name /sigh.

In anycase mystic knights spell blade converted all their damage to the element of enhancement VS additional damage... this'd make them potent vs high PDT- mobs, and as far as the magic tank totally with ya there, they'd have to make them stupidly broken to beat out aegis pld.

On a side note making protectra V fully merited 4x as powerful think that might actually make defense relevant again?