i know how to get secret book of giants but how do you get :
Giant's Secret Codex Of Discipline
Giant's Secret Codex Of Mastery

and i would like to know what they exactly do. is it just good enough for 1 skill enchant or can u maximize 1 skill? from +0 to +30 without any fails?

then you got some Buffslot books that increase 1 buff slot (total of +4 slots) as i heared. where can i use those books i got 1 but dont know wich npc i need to use.