waste of game data and a source point considering other magic non source skills can do more than it

A perfect skill for a physical class. Anytime there is an attribute-independent skill that deals the opposite damage to your primary (necromancy for mages, polymorph/medusa, skin flay for warriors) you should grab it, so that you can attack enemy weakness even if it's not your spec. Attack magic armor/gain magic armor compensates for two weaknesses of a physical class at the same time.

How does this scale? At the surface it seems absolutely terrible to me, so i'm wondering how the numbers are

red prince best prince, sure, but this skill is just meh when you have living armour talent

Do points in hydrosophist increase its effectiveness?