All credit for this mod goes to Erkil and his Team.


1) DESCRIPTION
Skyrim NPC Overhaul is a huge overhaul regarding most named and generic NPCs.
A synthetic list of changes:
a) Alik’r warriors, Bandits, Forsworms, Hunters, Nightingales, Penitus Oculatus Agents, Sailors, Thalmor soldiers and wizards, Vigilant of Stendarrs, Warlocks, Hagravnes and Witches have more power and abilities. These enemies will be more challenging then first! Be careful!
b) Stormcloak soldiers and guards, Imperial soldiers and guards are stronger. Now all soldiers have 20th level (the level is higher for captains and commanders) and all guards have 35th level (the level is higher for captains and commanders). Soldiers are able to heal themself.
c) Mercenaries, Adventures, Assassins and Thieves are stronger.
d) ALL TRAINERS and VENDORS are PROTECTED = killable ONLY by the player!
e) ALL possible FOLLOWERS aren’t essential anymore, but PROTECTED (killable ONLY by the player, so that they could be killed only in a fight with player) and a bit more powered.
f) ALL ESSENTIAL (with some exception) NPCs are become PROTECTED NPCs (= killable ONLY by the player), to give a bit more immersion to the game. ATTENTION! = Anymore immortal NPCs, but for this reason you should be prudent before killing someone (the risk is losing a quest – but the great advantage is a noticeable immersion “old school” – see Baldur’s Gate, i. e.).
g) ALL NAMED NPCs are stronger. Most of them could heal itself. The game is more challenging thanks to that. Some example? Destroying the Darkbrotherhood company will be very difficult now!
h) most of NAMED NPCs have a static level.
i) MOST OF NPCs QUEST-GIVERS and NPCs QUEST OBJECTIVES now are PROTECTED (=killable only by player).
j) ALL NPCs can use their racial powers once a day!
k) ALL NPCs finally have proper PERKS! Now they fight fully… so goodbye vanilla ridicoulos difficulty level.
l) Also FOLLOWERS finally have and use their perks!
m)NPCs usually in the wilds and dungeons (bandits, forsworn, adventurers, etc…) and guards have torches. People in cities and villages don’t have torches;
n) humanoid NPCs as farmers, dremoras, hagravens, draugrs and giants have and use proper perks!
2) COMPATIBILITY
Skyrim NPC Overhual isn’t compatible with mods that alter/change vanilla NPCs and vanilla Perks.
It’s fully compatible with Unofficial Skyrim Patch (suggested)