Arial Black
Adventurer
You could always multiclass rogue, then you can hide as bonus action.
No use.
In my OP I used a multiclass Rog/War as my example.
Briefly: I move to an area of dim light. I use my action to turn invisible via One With Shadows. I then use my bonus action to Hide via Cunning Action. Unfortunately, using that bonus action breaks my invisibility because One With Shadows ends if I take an action, and bonus actions are actions according to RAW.
So I've completely wasted my time! Never mind, I'll try again, but this time I'll do it the other way round:-
I move to an area of dim light, use my bonus action to Hide...oh wait! I can't Hide without cover, and it's the invisibility that gives me cover to Hide and I haven't got cover until I'm invisible.
It's a catch 22.
But wait! Why don't I just use the dim light as the cover I need for a Hide check? Well, if I could do that, what would I need One With Shadows for?
Remember, I'm not turning invisible to gain advantage or give my enemies disadvantage. I'm turning invisible because I don't want them to know where I am at all! But being invisible without also being 'hidden' doesn't do that, and One With Shadows prevents you from using your action to Hide.
This is the problem.