It wasn't entirely biological, in nature, almost more of a curse, and it seemed to be affecting both the victim's strength and health, though it does, indeed, boost their attractiveness, personality, and spellcasting potential.<br/><br/>If he does make any attempts to alter it, he'll find it very resistant to change, as it almost seems to feed off the physical life essence, in order to boost their mental capabilities; removing one would require ending it, entirely.<br/><br/>It's difficult to detect the origin of it, however; it seems to be fairly widespread, and slow acting; with little historical data to work with, tracing the progression is virtually impossible, especially since it affects people at different rates.