Elamiya: I don't disagree with you, but in this case it's more of a lorebook than it is a manual. 
 grassBlade: And, the "lorebook"/guide is essentially useless for gameplay. I. personally, would have preferred a D&D style user's guide, one that delineates the classes, the important attributes for that class, the spell list and what the spells actually do. Some info on which consumable should be used for 'swollen eye', for example. 
 You can download the manual at:   
https://support.obsidian.net/article/29-where-can-i-find-the-game-manual   The important attributes are not listed for each class in the manual, but I wroten them down in the following 'table': 
 The first numers are the essential stats, the second are the recommended ( Barbarian: essential strength and consitution, recommended dexterity and intellect)  
 Barbarian: 1,2 / 3,5 
 Chanter: 5,6 / 2 
 Cipher: 3,4 / 1,5 
 Druid: 5,6 / 1 
 Fighter: 2,6 / 1 
 Monk: 2,3 / 1,6 
 Paladin: 6 / 1,2,5 
 Priest: 5,6 / 1,3 
 Ranger: 1,4 / 3,5 
 Rogue: 1,4 / 3,5 
 Wizard: 1,5 / 3,4  
 1: Might 
 2: Constitution 
 3: Dexterity 
 4: Perception 
 5: Intellect 
 6: Resolve  
 Hope this helps! And have fun with the game...