Ok, again Larian is ignoring 5e rules instead of using them to not make it broken. Ok, so here is how it works in DnD 5e and it's perfectly balanced. Coming from someone who plays and leads as DM.
1. Bonus Action Hide is ONLY and EXCLUSIVE to Rogues on level 2. No other class can get it and there is no other way to get it in game.
2. Hide can only be made in combat if you are "heavy obscured" to enemy, meaning that they can't see you at all. So you can use Hide action in: total Darkness if enemies do not have Darkvision, Magical Darkness if enemies do not have Blindsight/Devil's Sight/True Seeing etc., thick smoke/fog (Like Fog Cloud spell) if enemies do not have you in their blindsight/tremorsense etc. range or Greater Invisibility unless again they have other senses to locate you. In short- enemies need to not being able to see you at all. There is Light obscured condition in 5e (like tall grass, light fog etc.) and heavy obscured (magical darkness, fog cloud spell etc.).
In practice is not that easy and common to use as you need to pair it mostly with some magical "heavy obscure" effect to allow you do it becasue encounters are not inside heavy obscured areas 99/100 times becasue why would they.
Every other class (unless they multiclass min. 2 levels into Rogue) would have to use Full Action to do that but they still need to be heavy Obscured.
Of course enemies can use their action any time to roll Perception check and try to beat your Stealth check for Hide and locate you. They can also use stuff like Fearie Fire, Detect Thoughts, Locate Creature, AOE damage and so on. Or find you with their Blindsight/Tremorsense/True Seeing if you are not behind total cover becasue then they just see you as you are not obscured at all.
So in 5e it's not that easy to do it and while it is potent tool for Rogue, it's not easy to set it up and it can be countered by many different ways.
Last edited by Benny89; 20/07/21 01:00 PM.