There's a power that should replace/improve(?) stealth. You can unlock it by getting rank 3 in all "previous" powers. What does this skill do? It's stupid you can't see it till you have unlocked it. If it's ****, you have to respec = zen, stupid setup if you ask me.
It's not a hidden power. It's not a power at all. You misread the tooltip. It says "Unlocks rank 3 in all skills upon spending 30 skill points" (I may be paraphrasing a bit). This means once you spend 30 points on powers you can start to raise your powers to rank 3. Before this you can only increase any power to rank 2.
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You can also see a better formatted version of the guide here.
> http://mopp4.net/ <