I'm curious about the Add Character Slot function. I've learned that the max is 13 (12 for normal servers and 1 for Heroic). However, it is never made clear how many characters I can have on one server while using this.
My question is, say I buy this 7 times to reach the limit, am I allowed to play all 12 characters on Solar? If not, how many can I have on 1 server?