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My Enchanting is at level 100, and I have:

  • Enchanter (5/5)
  • Fire Enchanter
  • Insightful Enchanter
  • Corpus Enchanter
  • Extra Effect

Here is a chart of the effect:

              (tested) (tested)   (theoretical) (theoretical)      (actual)
Glass Boots:  base     base+grand Elixir(*1.25) +Necromage(*1.31)  Actual
resist fire   +15%     +46%       +58%          +60%               +54%
regen stamina +10%     +31%       +39%          +40%               +36%

Game version is 3.10.0.

The end result is approximately a 17% boost to enchanting; even an Enchanter's Philter (+20%) should be better.

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up vote 19 down vote accepted

These results are correct, it's just that the potions are affecting your base skill rather than directly affecting enchantment strength. Enchanting's base skill has a particularly weak* effect on things (and it's non-linear, so only a fraction of that +x% manifests in enchantment strength); it's all about the perks.

The formula is

net magnitude = base magnitude * soul multiplier * skill multiplier *
                (1 + Enchanter perk) * (1 + specific perk modifier)

where skill multiplier is "approximately"

skill multiplier = 1 + (skill / 100) * (skill / 100 - 0.14) / 3.4

It is the above skill value that enchantments affect, not the net magnitude. Therefore, your skill multiplier should be

skill multiplier = 1 + 1.25 * (1.25 - 0.14) / 3.4
                 = 1.4081

Plugging that back into the net magnitude formula we get the following for Resist Fire (base magnitude = 15%) and Regen Stamina (base magnitude = 10%)

net magnitude = 15% * 1 * 1.4081 * 2 * 1.25
              = 52.9%
net magnitude = 10% * 1 * 1.4081 * 2 * 1.25
              = 35.2%

Like the UESP page said, the skill multiplier formula was approximate, so I'd say this is close enough. The point is that potions affect your base Enchanting skill, which has a non-linear and weak relationship with enchantment strength. In fact, Enchanting at 100 only grants +25% to enchantment strength over Enchanting at 15 (rather than 100 / 15 = 6.7x), so taking 2 perks and Enchanting 20 is better than no perks and Enchanting 100.

* It actually looks something like this. The above formula doesn't seem to be totally precise, but the gist should be evident:

Effect of Potion of Fortify Enchanting on Enchantment Strength

Notes (as the comments show I should have been clearer here):
+46% = Necromage maximum (5 items of Fortify Alchemy)
+37% = Max with 5 items of Fortify Alchemy (Falmer Helmet + Circlet)
+32% = Max with 4 items of Fortify Alchemy
+25% = Enchanter's Elixir (best non-crafted item)

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This is the best possible answer, much more than I expected. Thanks for the formula walk-through, I tried using it but my skill multiplier was wrong since I didn't know how fortify enchanting potions worked, and I didn't know what values to use for (1 + Enchanter perk) and (1 + specific perk modifier). Also the graphs really help. – user19087 Jan 31 '12 at 18:23
Enchanter's Elixir (+25%) with Necromage as a vampire (+25%) creates potions that give a (+31%) boost to enchanting skill. Like I said, this gives me a +17% boost to enchantments, which is close enough to 32% and corroborated by your graph. – user19087 Jan 31 '12 at 18:25
@user19087 Do not forget to mark this question as the answer then :) – James Jan 31 '12 at 18:30
I did a bit of digging, it appears +32% is the maximum value of the alchemy/enchantment loop using four items, and +37% is the maximum of that loop using the extra headgear glitch (falmer helmet + etc). So thanks for using a graph with those values. What people don't seem to realize is that with Necromage, the strongest possible fortify enchanting potion is actually 46%, which results a 25% boost to enchantment strength. – user19087 Jan 31 '12 at 18:38
Which is actually just amazingly powerful. Anyway I'm sticking with plain old +25% fortify enchanting skill Enchanter's Elixir, anything else in my opinion is – user19087 Jan 31 '12 at 18:41

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