GMS Monster Book (post chaos)

oh my, some have %atk/matk...also, is the Ignore Mob Def only applicable to the mobs listed in that segment, or to all mobs?

All mobs. It's a trait you get from completing the set. The monster book level determines what rate the trait gives. So, say you complete Friend of Day 1, that's 10 monster book exp, so you get to level 2 monster book. That also enables you to get 10 hp from the Friend of Day 1 set, instead of just 5.