现阶段，
书的最大能力加值可到
+5
属性书：使用后某项属性获得X点内在加值。使用多本时，同属性仅保留最高值。
获得方式：
随机箱子和
Raid特产
随机来源（都为
含）：
+1书 8级以上的箱子
+2书 15级以上的箱子

+3
书 23级以上的箱子
+4书 27级以上的箱子；U14任务链EE难度
+5书 Caught in the Web EE难度（目前无人获得过）
掉率为
333分之1
升级书：如其名字，是升级书，需要一层一层向上升。如2->3、4->5，不能直接2->4、1->5。
获得方式：属性书掉落时，有25%的几率变为升级书。规则为：3书变成U3->4书、4书变成U4->5书。

我的+4升级书在U16野外开到的，这意味着野外的箱子等级有27？

5书感觉是谣传，不过4-》5是存在的

+3书是22-23级箱子就可以掉落的。。。。。+4书得29级箱子或者EEC3

Originally Posted by Feather_of_Sun
The chance of tomes dropping is actually getting a significant increase. Currently on Live, every item generated in a chest has a 1 in 434 chance of being an ability score tome. In Update 16, those odds are increased to 1 in 333. The new Upgrade tomes will be a sizable percentage of all ability tome drops- for example, when a +4 tome would drop, it will instead have a 25% chance of being a +4 to +5 upgrade tome. Same goes for +3 tomes (which will drop in treasure chests of level 23-26): 25% of them will be a +3 to +4 upgrade tome.
Originally Posted by Feather_of_Sun
On Live, +4 tomes follow a previously established formula, and appear in level 31 treasure. When we were releasing Menace of the Underdark, I thought that we should make them more accessible than that, so I also implemented them as bonus treasure in Epic Elite quests. With Update 16, I've revisited this, and received permission from my boss, Eladrin, to change the formula which determines what levels the tomes appear at in random treasure. In Update 16, which is currently on Lamannia, +3 tomes appear in level 23-26 treasure, and +4 tomes appear in level 27+ treasure.

+4 Tomes unbound can drop in
Caught in the Web on any difficulty. They can also drop in several
Forgotten Realms quests on Epic Elite difficulty. In theory, they should also drop in level 29 loot (e.g.,
The Druid's Deep quests on Epic Elite with +2 global loot bonus active and +2 jewel of fortune).

+4书不绑定的不止eeC3出，eeC1C2也出，另外，绑定的，包括TOD任何难度，EVON6任何难度，EDQ2任何难度，

EE C1-C3出的不绑定+4书是作为一种特产出的，要单独计算

问太多了也没用，多刷本 什么都有了