Just an idea for sub system

[Sanctus]

I know is late now coz we all choosed a class knowing we wont stack it.. but it would have  been a good idea to be able to stack it and have your skills stacked only when you switch to your stack.. when you switch again to your main you dont.. you still have your oly without sub, epics, etc.. but your class will be useful in other places when you switch to your stack.