UPDATE: TES3MP updated to 0.8, and in doing so, it upgraded to using OpenMW 0.47 as a base. This means that, if you are running TES3MP v0.8 or greater, you actually want to get the OpenMW file. I will however leave the TES3MP file up for those who insist on still using 0.7.

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I was always pretty annoyed by how NPCs could enchant with a 100% success rate and you couldn't no matter what. This mod fixes that! Other mods exist that attempt to do the same thing, but after investigating the files from those mods and doing some research, I found that most of these mods actually make enchanting harder due to a misunderstanding of the enchanting formula. This mod is tried and tested, and will work for sure.

This mod will not make it so you can create god items at the beginning of the game. It was balanced so that when your enchanting skill and intelligence were each 150, and your Luck 40, you would be able to make any enchantment (max 360 enchantment points for Exquisite Rings and Amulets) with a nearly 100% success rate. You can now truly become a master of enchanting, without potions or other exploits!

Non-OpenMW and TES3MP Users:

The old formulae:
Cast Once Success = Enchanting + 0.25*Intelligence + 0.125*Luck - 2.5*Enchantment Points
Constant Effect Success = Enchanting + 0.25*Intelligence + 0.125*Luck - 5*Enchantment Points

The new formulae:
Cast Once Success = Enchanting + 0.25*Intelligence + 0.125*Luck - 0.083*Enchantment Points
Constant Effect Success = Enchanting + 0.25*Intelligence + 0.125*Luck - 0.2569*Enchantment Points

That might look like a crazy change up there, but that's because the vanilla game is so massively unbalanced.

OpenMW users: Your formula is slightly different because OpenMW's enchanting success formula is completely different from vanilla, so note that your success rates at lower levels will be different from the non-OpenMW version, but they are still balanced around being able to make any Cast On Use/Strike enchant with Enchanting 100, Intelligence 100, Luck 40, and a full fatigue bar, and any constant effect enchantment with Enchanting 150, Intelligence 150, Luck 40, and a full fatigue bar.

Here are the OpenMW formulae:

Old formulae:
Cast Once Success = Enchanting + 0.2*Intelligence + 0.1*Luck - 3*EnchantmentPoints) * fatigueTerm (1.25 at full fatigue)
Constant Effect Success = Cast Once Success * 0.5

New formulae:
Cast Once Success = Enchanting + 0.2*Intelligence + 0.1*Luck - 0.1222*EnchantmentPoints) * fatigueTerm (1.25 at full fatigue)
Constant Effect Success = Cast Once Success * 0.5682

--- RECOMMENDED MODS ---
MCC Leveler - Does a number of things that make leveling less awful. Since the mod was balanced assuming you have an uncapper installed, I'd grab this for balance reasons. After all, you could just dump all of your levelups into Intelligence and become a master enchanter way too early in the game.

For OpenMW users:
Natural Character Growth and Decay - Has pretty much all the same features as MCC Leveler, but is specifically for OpenMW, and also includes uncapped skills and attributes. Non-OpenMW users can of course use the MCP to uncap these, and you should definitely do so, because otherwise you will have to use potions still to achieve a 100% success rate for constant effect enchantments.

-- INSTALLATION --
Use your favorite mod manager, or just drop the .esp file into your Data Files folder.

-- REQUIREMENTS --
There is now a version for non-OpenMW users and a version for OpenMW users. Be sure to install the correct version!

-- COMPATIBILITY --
Should be compatible with anything as long as it doesn't change fEnchantmentMult, fEnchantmentChanceMult, or fEnchantmentConstantChanceMult.