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Certain enchantments can be applied to multiple items, such as both an amulet and a ring. If I wear two items that grant the same bonus, does the bonus stack? (e.g. if I wear an amulet of +12% Alchemy and a ring of +12% Alchemy, do I get +24% to Alchemy?)

Also, do some enchantments stack while others don't?

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5 Answers

up vote 7 down vote accepted

Instances of Fortify X (Where X is "Conjuration, Smithing, One-handed, etc.") stack if they're from separate items.

You cannot use the "Double Enchantment" perk in the enchanting tree to double-enchant a single item with the same enchantment, twice.

Unlike in Oblivion, stacking skills above 100 actually increases their effectiveness.

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Well, it should increase their effectiveness. However, there's evidence that this is bugged, at the very least for Pickpocketing, and possibly for Enchanting and Smithing as well under some circumstances. –  LessPop_MoreFizz Nov 19 '11 at 4:32
    
@LessPop_MoreFizz you're referring to > 100 skill only, yes? –  Raven Dreamer Nov 19 '11 at 5:57
    
Yes, only for >100. –  LessPop_MoreFizz Nov 19 '11 at 16:12
    
I tested this with multiple items of Fortify Smithing, and confirmed that it works. Adding the second item allowed a weapon to be upgraded further than one item. Do non-skill enhancements stack (e.g. Fortify Carry Weight, Fortify Health, Fortify Magicka Regen, Resist Magic)? –  Jonathan Drain Nov 21 '11 at 19:22
    
@JonathanDrain yes. –  Raven Dreamer Nov 21 '11 at 19:48
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Smithing doesn't stack. I have 27 Smithing skill and have 4 items of 20% smith fortify each. No smith perks.

I could only upgrade items to Superior (required: 31 smithing).

By the math I should have 27 + 80 smith skill, enough to do Flawless upgrading, but I couldn't.

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The enchantments stack multiplicatively. –  LessPop_MoreFizz Nov 22 '11 at 2:11
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It's 27 plus 80%, not 27 plus 80 points. You'd be at 48.6. –  Jonathan Drain Nov 22 '11 at 2:55
    
@Mochan in order to upgrade to legendary u must have the required perks, However the enchantment doesnt boost your level it lets you improve them more eg if a sword had damage 10 and if u improve it to flawless (with no perks) it has 12 damage. 20% of 10 is 2 so if u put on the equipment u would be able to improve it to flawless with a damage of 14. –  user19660 Feb 9 '12 at 2:41
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I can confirm that +carry weight, fortify alteration/destruction, better prices, +health, and +mana all stack. I have boots and gloves of +37 (I think) carry weight, and they stack additively to 374 total (from 300 base), and stack with my Voldun mask which adds another 20. Fortify alteration/destruction are additive, so four 25% mana reduction enchants stack to 100%, or zero mana cost. Voldun mask reduces prices, then equipping the Amulet of Zenithar reduces prices again, though I haven't checked to confirm it's additive (i.e., it should be 20% + 15% [I think] is a 35% reduction, which is close, but I haven't confirmed it). +health and +mana stack additively.

I know +weapon skill enchants stack, but I haven't really played with them. I believe they stack additively, then the combined percent is compared to the weapon damage. So if you have an improved weapon with perks and stuff, and it's sitting at 50 damage at a skill level of 75, then you get four +20% weapon skill enchants, they would add to +80%, and 75 + (80% * 75) = 180% * 75 = 135. Then, your actual damage would be measured as though you had a weapon skill of 135. As far as I can tell, skills scale linearly, so your final damage would be 180% * 50 = 90 (if this is true, you can just calculate +weapon skill enchants as though they are +weapon damage enchants).

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Smithing stacks, but it does not fortify your smithing level, only the upgrade value of armor or weapon.

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I'm not sure about smithing improvements to weapon damage but I have been experimenting with armor on the workbench. I have around 50 smithing and 4 items with improved smithing perks. +22 Amulet, +16 Fine clothes, +16 Ring, +16 braces. When improving Ebony armor, I first used all items together and drank a smithing potion which was supposed to improve an additional 51%. My Armor went from a 78 rating to 102 flawless. After going back to the previous save, I tried it again with only the Amulet, ring, and potion. I still got a 102 flawless armor rating. For me, that means there was no improvement with the other two items, but I didn't pay attention to whether there was a price difference or not. Perhaps once you reach a certain level of flawless, it doesn't matter if you're stacking items or not. If anybody has experience with this, I would appreciate the advice. I've been carrying around extra items for stacking skills but I now think a lot of them are a waste of energy.

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What is the conclusion of your testing, exactly...? –  LpSamuelm Nov 30 '13 at 3:17
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