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My house rule for this - Creatures with darkvision emit a special kind of light that only they can see. It comes from their eyes and is absorbed back by the eyes. A creature with darkvision can't see the darkvision 'light' of another creature, but there are (homebrew) spells that allow a spellcaster to see the 'cones' of light emited by a creature with darkvision....4. How does Darkvision even work? If there's no light, how do they see at all? This is why I house-rule that all creatures with Darkvision have infravision and infrared bioluminescence...
They secure small overlapping metal plates to the inside of the leather (or more often heavy cloth) garment. “Studded Leather” is just one among many examples of Victorian scholars misinterpreting depictions of armor in medieval artwork.3. Studded Leather Armor. What do the studs even do?
What do the studs do?! You are a simple soul aren't you? The studs look COOL. And adding shiny metal accents to your black leather is what any righteous EMO elf ranger needs, right up there with eye shadow and a tortured back story. What do the studs do, honestly...
Studs aren’t emo, they’re punk. Some forms of goth fashion also employ them, unsurprisingly as goth is an offshoot of punk. Emo is also an offshoot of punk, but studded leather was never really part of emo fashion, except in belts, and even that was mostly a result of burgeoning alt kids getting what ever random accessories from Hot Topic we thought were most likely to make the adults in our lives uncomfortable.
These have actually been fixed in 5e. Well, it still calls mail “chainmail” but at least the term is just redundant instead of inaccurate. “Platemail” is just plate now, the bastard sword and long sword were appropriately combined into a single weapon called the longsword that can be used in one or two hands. They should call the shortsword an arming sword though.The system refers to mail as 'chainmail', and plate as 'platemail'.
What's called a bastard sword by the system is actually a longsword.
What's called a longsword by the system is actually an arming sword.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.