1. these skills are obtained automatically, prefers what are you playing for... if you are mage, you will get c. speed skill, and defence, if you are fighter, you will get defence, and att power, if you are dagger, you will get reduce mp consumption and vittal rate. but they appear only for 4seconds;] and appear from nothing. sometimes you will get them when evading, sometimes, when you do a critical, sometimes, on shield success ;]
2.these book drop from : www.l2dropspoil.com ;] as i remember.
3. yes you can augment these, but only in global. javas still don't have these abilities, even if they are gracia pt2. only one server till now has this ability w/o global. (i would tell you this server, but as i know, i can't advertise)
4.talismans are for a small amount of something. there are bracelets of different types: C B A S grades... C -1sot B-2 A-3 S-6 :) you can obtain them from fortress or buying.talismans give you a 5% or smth for some of your abilities. maybe hp/cp regen. maybe mp regen, maybe m att, maybe p att, maybe defence and so on, but they vanish after 1hour. they are not cheap, and better cost more :)