For now The Enhancement System adds/changes following things:
It is much to read,but I promise it is worth the effort
New Features are red marked

Weapon/Armor related Features:

Giving all relic swords upgrades - once you find it you can dismantle it to get a schematic to the next stage. All higher upgrade diagrams have been added into the loot/quest reward system


 Giving Geralt access to NPC only weapons: Now you can use Eredins Sword,Imleriths Mace,Caranthirs Staff,Vesemirs Blades,Zoltans Axe,Ciris Zirael and some other NPC weapons
as your own, by buying and/or questing.With fixed and partially custom animations! Eredins Blade will no longer be taken from your hip and appear on your back.


Redefines all relic weapons from scratch,to be useful  and ready to upgrade.No relic weapon you know will have the same effects as before!
Also completely re-worked from Relic Weapons Redone, hopefully not so OP.


Integrating the Viper Kaer Morhen Armor and blades as fully 5th Witcher Gear - with upgrades,actually marked as witcher gear(green in menu) 


Vesemirs Blades and Teigr from Cat DLC are also upgradeble


Upgrade your favorite Fraction Armor! All 3 DLC Armors (Temerian,Nilfgaardian and Skellige) have been included into the crafting system. Now you aren`t limited to Witcher Gear anymore.You can just upgrade your favorite relic fraction armor,to keep up with Witcher Gear!


 Some crossbows redefined for more usability,and also added to the upgrade system. Now you can upgrade Skellige/Nilfgaard/Elven Crossbow as well as Lynx/Bear/Death from above Crossbow!


 Relic Weapon Merchant added: The Hattori in Novigrad will sell you  all loot originals of the relic swords - if you missed or want one. He is used as a base to upgrade.


Unbreakable Relic and Witcher Swords,also all Witcher and DLC Gear on highest upgrade stage added - why calling it legendary stuff when it breaks all few minutes?


Intelligent crafting system: Ingots and ingredients are logically placed.When a Sword is dark,you`ll need Dark steel ingots.When it gets an bleedingeffect on the next stage,you`ll need the corresponding Rune for it - in that case Rune Devana. In most cases abilities are logical placed too-if a sword has edges it will be likely that it causes bleedingeffect. On highest stage all blades are perfected with a touch of diamond dust. Also you`ll  need for an Level 3 upgrade both before upgrade schematics + the sword on stage 2
You`ll get most of the materials back from de-crafting.


Adds throwable knives as secondary weapons to the game.


Crossbows completely redefined for more usability


Sword effects added,you can always change them in the mod menu.I suggest when you use a sword which can burn people,you turn on the fire effect,when using a sword with stagger effect you turn on the yrden effect and so on.Of course you can use as many effects as you want @the same time - or even not.


Adds some completely new weapons to the game,and retextures a few others to look more like in the previous games.I felt that this shouldn`t hurt anyone,as most blades in the game look alike either.
 

Treasure maps are now much more expensive and are only sold from the book merchant in Novigrad @ the Hierarch square.Vanilla ones were simply too cheap for that what they offer: the way to the most powerful items ingame.You can find them without treasure maps,or you pay a price worthy for what you get from it.


Gwent related Features:

More Gwent bet added (50 Gold - not to less and not to much,but you could need that extra money)
My other mod  "The Gwent Card Dealer" is also integrated,as he doesn`t harm someone - otherwise there would be compatibility issues between my 2 mods - he is located in the tavern on the crossroads and will sell you Gwent cards you could otherwise only buy at merchants coming later in the story- it is useful as you otherwise play 95 % of your Gwent Card games with your Temerian Deck...am I right?
Gwent changes are fully compatible with other Gwent gamechanging mods


Money related Features:

You will find more money in the world,but therefore I have given a small carry weight to it.Dont worry,you can access your money now and store it into your stash.Also I made it MUCH lighter than it was in the previous testversion,so it shouldn`t be a big burden anymore too soon.
Optional Version without money carry weight available too


Menu related Features:

Now you can see the real value of an item before selling it for a too less price or buying it for a to high one.There was added a value amount slider for any stackable item in the players chest.Also the crafting menu was totally enhanced,now you see new craftables marked,the required level for it and you can filter the list through various options.


Animation related Features:

Taking different potions and applying oils to a drawn sword will now trigger an animation.Now you have to wait for the moment in battle where you can drink your potion! Makes things a lot more difficult but more immersive as well,and counteracts the fact that some weapons are stronger now than the vanilla game offered on purpose.
Quen is your best friend ;)
Optional Version without Animations available too


Other Features:

You will find more herbs now when looting a plant.Also you will get more quest rewards,many of them books,notes,weapons,armors or diagrams.The books and notes are cut content.

Multilanguage mod:

This mod was translated into nearly every language and can be used without Custom Localization Fix now.
There are just missing the Japanese translation and translations for the HoS add-on.


Hearts of Stone DLC add-on:

The HoS add-on makes many items of the HoS DLC much earlier available for the main game.You can buy them from Yoana in Crow`s Perch as soon as you meet her.Also it makes all those items upgradable and redefines them for a better use.


There will be no optional TES version for a medium Kaer Morhen Armor anymore,as the Viper armor from HoS serves for that use now.


More informations about it you can find one topic below.


-There will be more instructions in the "Posts" tab