The warlock invocation, 'One With Shadows' reads,"When you are in an area of dim light or darkness, you can use your action to become invisible until you move or take an action or a reaction."Brilliant! So, I just take my action to do this and I'm invisible, hidden from view and able to attack from hidden to get advantage on my attack. Right?
No. being invisible is not enough. To be hidden, you have to take the Hide action while in cover, and if your cover goes away then you are no longer 'hidden'. Invisibility counts as that cover, but you still have to take the Hide action in order to count as 'hidden'.
Okay, I move to an area of dim light, use my Action to use One With Shadows to become invisible, then use my bonus action to Hide, congratulating myself on being a multiclass rogue/warlock.
As soon as you use your bonus action to Hide, your One With Shadows ends. It ends because it says that you are invisible until you use an Action, ans a bonus action counts as an Action. Since your invisibility ends, you no longer have cover so you are not 'hidden'.
Okay, I'll do it the other way around! I'll move to an area of dim light, use my bonus action to Hide and then....
No! You can't use your bonus action to Hide at this point because you don't have cover! You're not invisible yet.
What? Then how can One With Shadows actually work? Maybe we could say that the dim light I move to counts as enough cover to use a Hide action to become 'hidden'?
Yes, we could.
Er...if I can become 'hidden' without becoming invisible...then what's the point of One With Shadows?
Anyone?
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