like for example
getting an item one can add to your main class from another class skill and can then use it all the time but that skill alone can be of two kinds manege
as in dragon-network or a way to do something similar to what has this server
in dragon-network is achieved by drop item called Horm
from there a npc you merge your class to any profession of your main class
fusion can do this with your main class or a sub-class you have made
example
race = elven mystic
Main class = spell singer
sub1 = necro mancer
Sub2 = paladin
sub3 = Hawkeye
then in the npc you joined two classes or you do with the main class
sub-class or some
clear only can join the class at any of race to be the character
ahci can ahcer many combinations taking into account your race elven, human, orc, etc.
and in the same dragon npc that the option exists to change the class who are united
example
let's say you join
sub1 (necro) + elven elder (belonging to class elven race)
then we can change the npc to necro elven elder
then if we necro our basic points as INT-WIT-MEN belong to necro and we can change npc elven elder and have the basics of elven elder and have the highest casting
I hope you were able to understand