In Tree of Savior you can combine several classes into unique characters in the way it fits your playstyle the most or experience an unusual fantasy that few games provide, currently the game offers 76 classes to play with spread across 5 different class tress. Each class has different strength, weaknesses, skills, attributes, weapon usage leading to a different experience for each one, additionally you can combine them with other classes
The first class a character has is called Basic Class and those are Archer,Cleric, Scout, Swordsman and Wizard, each one has different characteristics and has a different set of weapons to pick from. Basic can level up to 15 and have only five skills with 5 levels only, once a character hits level 15 it can get an Advanced Class. Being the bottom line of the class system that enables branching into other classes they give name to class trees. Once a base class is picked it can never be changed.
Unlike Basic Classes these are more specialized classes with distinct traits, they also have a higher level cap at 45 and skills that can be taken up to level 15. Each character can have 3 different Advanced Classes and all them are available as the first advancement, the exception to this are Hidden Classes. One interesting feature Advanced Classes have are the special attributes unlocked with base level, these are stronger than the usual and serve as progression rewards untied to skill level.
Currently each class tree has a single Hidden Class that is unlocked through an unique quest or by using [Class Unlock Voucher], quests take considerable time to be finished while vouchers can be obtained through TP Cubes. It is possible to purchase unlock vouchers from other players in the market. Despite the hurdles none of the classes is inherently stronger than the average Advanced Class, they only provide different tools that are exclusive to them that can be useful on their own or to complement other classes.
An interesting fact about Hidden Classes is that their policy changed over time, initially they weren't listed in the advancements, didn't had their release listed on patch notes nor could be found in the official website. Miko was the first hidden class to appear in patch notes and was followed by Appraiser with no release official record, Nak Muay was the latest addition and was listed as "new hidden class in Swordsman tree". After Rank 8 Expansion those classes were made visible in the advancement regardless of the unlock status and they were added to the official website as well along the Re:Build Patch.
Class Stat Modifiers
Each base class provides additional modifiers to secondary stats, bellow is the comparison of each one of them.