Another UA Ranger Question

[sir_argo]

The following text from the UA Ranger is not as clear as it could have been:

...
You are also adept at evading creatures that rely on darkvision. Such creatures gain no benefit when attempting to detect you in dark and dim conditions. Additionally, when the DM determines if you can hide from a creature, that creature gains no benefit from its darkvision.

Which of the following are true and which are false:

1. The Ranger cannot be seen with darkvision.

2. If a creature can see the Ranger only because it has darkvision, the Ranger can attempt to hide anyway.

3. Once hidden, a Ranger is essentially invisible to darkvision.

[BurgerBeast]

1 is false.

2 is true.

3 is false*

* with the caveat that if you consider a hidden character to be essentially invisible to regular vision (which I do not), then you would probably consider 3 to be true.

[Lord Il Palazzo]

The following text from the UA Ranger is not as clear as it could have been:

...
You are also adept at evading creatures that rely on darkvision. Such creatures gain no benefit when attempting to detect you in dark and dim conditions. Additionally, when the DM determines if you can hide from a creature, that creature gains no benefit from its darkvision.

Which of the following are true and which are false:

1. The Ranger cannot be seen with darkvision.

2. If a creature can see the Ranger only because it has darkvision, the Ranger can attempt to hide anyway.

3. Once hidden, a Ranger is essentially invisible to darkvision.How this ability works kind of relies on understanding the lighting rules and how darkvision works. Looking at or for something in an area of dim light gives a creature disadvantage on its perception checks and being in complete darkness means that the creature automatically fails perception checks that rely on sight and has disadvantage on attack rolls while other creatures have advantage on attack rolls against them (basically, they're blinded). Darkvision allows a creature to treat darkness as dim light (so disadvantage on perception but not attack rolls) and dim light as full light (so no disadvantage). The Underdark Scout ability keeps a creature's darkvision from negating their disadvantage to find you or downgrading their "can't see you" to disadvantage. It doesn't technically make you invisible to creatures with darkvision (since that a specific thing) but it can keep creatures from seeing you if you're in total darkness.
Hiding relies on what your DM allows, but a creature with disadvantage to see (or that can't see you) you should give you more opportunities to hide and either way the creature will have disadvantage on (or flat out fail) perception checks to find you using its sight once you're hidden.

So I guess the short version is
1) False
2) Sometimes true, depending on your situation and your DM
3) False, though you're pretty close to invisible if you're in total darkness (you basically have the same benefits) whether or not you're hidden.