Umbral Shroud overhaul for Gloom Stalker

Now, first of all, I wanted to make Umbral Shroud works just like 5e RAW (so invisibility in full darkness) because Gloom Stalker is my favourite subclass in 5e. I even manged to get that working (apart from it being auto toggable) like in 5e, however then I realized after playing with it that it just doesn't work/won't make sense in BG3 with how the game is designed.

This is becasue illumination/darkness in this game is absolutely basic and pretty much ignored vs 5e rules and even in Underdark in most circumstances you will have Light Obscured condition at best as everywhere there is some illumination (not to mention spells/fire effects etc. having mechanical source of illumination). In dungeons/underground/cellars with all light sources turn off, you often will only see Lightly Obscured. Even in Underdark everybody are using torches and light sources for some reason, despite all races there having Darkvision... Darkvision also has very little impact in this game. Overall if I wanted to make it as 5e RAW (darkness), it would have to only work under Heavy Obscured condition, which means pretty much never in this game. There are places where it would work (like parts of Act 2 are Heavy Obscured) but that would be it since we can't even force night conditions in this game.

On the other hand, if I made it work constantly under Lightly Obscured, it would be beyond OP as you would be be invisibile most of the game apart from very bright sunlight places. So in the end I decided that it just won't make sense either way.

So instead after hours of testing I decided to make my version of it that is still strong, thematic and enchances Gloomstalker ambusher theme while being balanced (if such word even exists in 5e... probably not). So with this mod Umbral Shroud is:

1. You need to be Obscured (light or heavy) to use it

2. It's OncePerCombat ability, otherwise no resources/cooldown

3. It costs no action to use

4. It makes you fully invisible for 1 turn. Nothing you do will break it so attack away with advantage!

5. It auto turns off if you step into "Clear" area so stick into shadows, Stalker!

6. Added under "Optional Files" a version that makes you invisibile for 2 turns  if you think 1 turn is too weak/short.

This makes it so that you can still use it on turn 1 without losing any actions to get advantage and maximize your DPS with Ambusher (I also recommend my mod where you can get second Ambusher attack with Action Surge like you should in 5e) on your turn 1. It works well with sneaking as you can open from stealth with advantage attack to Surprise, and then on your turn turn invisibile to secure rest of your shots.

I think this plays well with who Gloomstalker should be and to maximize what he does best: 1st turn Nova and you can use it also as means to retreat/hide in middle of encounter if you had other means to secure your first 1-2 tur