Sub-classes?

[Icarus]

How do I access the next classes' areas (Paladin/Summoner/Dark Knight)?

 

[Ancient]

you have a long time to go until you get there. just dont worry about it and play through the game, and eventually, you'll get there and be able to make your choice for a subclass.

 

[Rukai]

You need to reach Archades and your still a LONG WAY to go before you can reach there. You will be around lvl 70-100 by the time you got there.

 

[Ironman]

firstly you have to complete your main class tunnels.

then you gotta head through to Conhaggen (min level of 38)
then to hells way to kill Gilgamesh (party is best way to do so)
after Gilgamesh you head to Ruby plains,then rocky roads, then Badlands, and then your there, after a couple of bosses aswell...so good luck