When viewing the destiny app under your character and under the equip class, you are able to equip the subclass that is associated with your class well below the unlock level. It also works on the web browser variant. I can confirm this because my level 2 warlock has sun singer when you're suppose to get it at 15. Hope this helps bungie staff.
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Once you get any character to level 15 all your other characters even if you start them can have access to both their subclasses from the start. It's not a glitch, it's how the game was designed. You can do this for your level 3 character in game or for any new characters you create.
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If you have another character over 15 you get it for the other character
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It goes way beyond that. Once I unlocked sun's inger for my warlock at l15, I took a break and started a new titan. Somehow, both trees were available from the start. I now have a level 2 titan who is progressing along the second skill tree, the one with the shield!
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Bump I just did it