I found out that you can enchant armor to reduce the Magicka cost of a certain magic school to zero. What are the requirements to do this, other than 100 Enchanting? Do I need certain perks to do this, or a potion?
I gave a detailed explanation of the formula in this answer.
See below, but here's a rundown:
There are three main ways to use the 33%/Necromage build: maxing out schools, spreading the benefits evenly or using the Archmage's Robes. Again, I'd recommend the Archmage's Robes. Note that you can invest an additional 2 perk points in any of the above to get Extra Effect (via Corpus Enchanter). The magicka cost becomes as follows:
* All of these assume you remain a vampire, in which case any Fortify School bonus will be increased by 25%.
To further increase the above effects, you can utilize the Falmer Helmet + Circlet exploit.
25% on 4 items
Since perks are more dear than skill points, let's assume you have 100 skill and an Enchanter's Elixir (alchemy produces weak potions even at 100 skill unless you invest some perk points):
We can plug in some values to get to 25% net magnitude:
Once we have one rank in Enchanter, we can get Insightful Enchanter, which is the best single perk for Fortify School enchantments and provides a 25% bonus (plus you should probably go this route to get to Extra Effect). Therefore, we only need to solve for the number of ranks in Enchanter:
Therefore, at minimum we need 4 ranks in Enchanter.
29% on 3 items + Archmage's Robes
Another possible build uses the Archmage's Robes, which already provide 15% Fortify to all schools of magic. I prefer this because a) it's more attainable than Necromage, b) being a vampire really isn't that fun, and c) it doesn't require the Falmer Helmet exploit and d) you also get +50 magicka and +100% magicka regen. You just need the maxed alchemy/enchanting loop:
33% on 3 items
It goes without saying that we'll need all of the above and then some. Then we need to solve for what amount of bonus x we need to apply to our Enchanting skill to get to 34%:
So you need at least a 56% boost to Enchanting. The solution to this is becoming a vampire with the Necromage perk. Necromage boosts the effect of everything you do to an undead by 25%. If you're undead, that includes you. So all of your own enchantments and potions are also 25% stronger. The alchemy/enchanting loop can then net you a +46% Fortify Enchanting potion. This requires:
You would use a fortify X enchantment, which you need to obtain by disenchanting an item with that enchantment on it already. It will reduce the cost of casting for that particular school of magic.
You can do 4 items at 25% each with a grand soul stone, with only 5 perks in enchanting.
If you use alchemy and vampirism/necromage, you can achieve 33%, I won't go into that here though. It takes 6 enchanting perks, 7 alchemy perks (I think, might be 6), and 3 restoration perks.
protected by kalina Mar 19 '13 at 9:36
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?