There have been several interesting takes on a talent tree or skill progression in gaming over the last few years.
Path of exile comes to mind for a long term player progression.
The instant changeability of the Diablo III system
The 3 tree version that WoW uses
What would you like to see, and how would you like it implemented?
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I want it to be similar to Skyrim's skill trees. However, I want it to have more depth and less exploitability. I want the skill trees to have a lot of options so I can tailor and combine perks to suit my preferred play styles.