high effort thumbnail btw
shoutouts if you got the phantom notif btw
Penumbral Armor comes out of a chest in Act 2, also very early.
Resonance Stone comes at the end of Act 2.
Gloves of Theivery can be bought early in Act 1 from Brem.
Silver Pendant can be found early Act 1, at Harper Lookout near Druid Grove.
On Darkness, Obscurity, and Line of Sight: Fog and Darkness both block line of sight AND make you heavily obscured. However, if a character with darkvision were to also be inside the cloud with you, or for whatever reason you were to leave the cloud, OR god forbid you were to fail a pickpocket roll you would have to make a stealth check against them. If you lose this stealth check, you will enter combat. This is the reason that Penumbral armor is better than Graceful Cloth for the big +3 to stealth (but only if you can get Dex/Slight of Hand advantage from elsewhere, and also only if you have 20 dex already). Also watch out for enemies with Devil Sight, who can see in Fog/Darkness/Heavily Obscured.
Feel free to use Scrolls of Fog/Darkness, or Darkness Arrows to block line of sight. These work exactly the same way as the cloak, the cloak is just resource-free.
Additional Build Clarification: You can get a way with literally a single level dip into rogue just for Expertise, so long as you already have Stealth/Slight of Hand Proficiency. Rogue subclasses offer minor differences (Free disguise as assassin, invis sneak as Theif). Taking a 2nd level for Cunning Actions makes it super easy to run away if you get caught by double-dashing away. Going all the way to 11 in Rogue gives Reliable Talent which removes your ability to roll less than 10 aka you can't crit fail. This makes Astarion an even better choice over Halfling if going all the way, but if you are using this character for combat I recommend multiclassing making Halfling just as good.
Take Alert as one of your feats. This will help you to go first in combat, and for robbing people it will help you escape before anybody can act. Alert is one of the strongest feats in the game, so take it first especially if you are a party character.
Also, there was no "Darksight activating", I think that was just another person rendering or entering the building.
LMAO I really should've just said all this in the video bruh