I'm not sure why Foresight would be included as part of the Shadowskin/Rampart thing. It has as much in common with them as Convalescence and Thrill of Battle do; "20% something for 20 seconds"
Less in common actually, Convalescence and Thrill of Battle at least help when magic damage is going out by way of ease of recovery or extra cushioning. Foresight doesn't touch the Magic Defense stat, only Defense.
