so like do you eventually end up maxing out every skill for that specific role/class or ? and whats the best way to build a group etc. also can you master every role on one character or do you focus on one? thanks

each character has 1 role they are best at and then 2 more that they are competent with... however at a point in the game everyone gains access to all roles but the nodes on secondary trees are very expensive so you wont be maxing out those until post game

later in the game you will have access to all the roles for all the characters. then maybe you will have to choose out from the weapons and the speed of the characters casting each abilities for the maximum strength xD