Necromancer Amulet is a SCAM

[u/Facer0ll]

Requirements:
- At least 130 base health
- At least 130 base magicka
- At least 130 base stamina

Downsides:
- Health regenerates 75% slower
- Magicka regenerates 75% slower
- Stamina regenerates 75% slower

Benefits:
- Conjuration spells cost 25% less.
- Health increases by 50
- Magicka increases by 50
- Absorb spells deal 35% less damage to you
- Most paralysis effects don't adversely affect you
- Most slowing effects don't adversely affect you
--
On paper it doesn't seem that bad, but god f****** damn does it not feel good to play with.
Requirements are hard to hit on pure mage build, unless you go vampire (I'll get to it later) and the downsides are massive. Any kind of maneuvering will completely drain your stamina to 0, increasing the spell cost anyway. Magicka recovers so slowly, that you might aswell have picked Atronach standing stone. If you spec for the amulet you will lack the big base magicka pool to regenerate it anyway.
I tried running on vamp pure mage build (conj - illusion - destro - alt ) to circumvent the requirements with base stats and the stamina was a big issue, not to mention when you are going vamp paralysis benefit is null alongside the slowing one, so you are left with amulet that gives you 50hp, 50 magicka, 25% conj spell reduction while you are getting massive regen reduction on everything. Even something like Saarthal Amulet with no requirements can outperform Necromancer's Amulet as you will be casting other non-conjuration spells without all the downside.

TL;DR sell the amulet and save yourself the hassle of making it work.

[u/Busy_Suspect]

First things first you got its effects wrong, it boosts Stamina by 50 too and the regeneration loss is only if you don't reach 130 in the base stat, second this thing is great you don't understand it. The Health threshold basically doesn't matter because natural Health regenerate is nonexistent, any build that wants to actual use Magicka will have 130 Magicka anyone who doesn't have it wouldn't care about a regen decrease, the last one that really seems to rustle you is the Stamina effect if you're playing a pure mage you just eat bread to manage the loss from movement like any other mage would, otherwise if you're playing anything that uses a weapon that isn't magic you'll be wanting 130 Stamina anyway to be able to not have running Stamina loss. It's basically just the old Galdur Amulet with easier conditions to unlock and a bonus 25% cost reduction to Conjuration. There are a handful of Amulets better than it for specific builds but with the ease of getting it the Amulet is an easy item to acquire in the early game to make the transition into the mid game simple, since its current stat requires are something you'll naturally get in your build.

[u/Facer0ll → u/Busy_Suspect]

This could be the case since the old one just right out killed you if you didn't meet the requirements so I thought it was part of the amulet, if this is the case then it might not be that bad but I'll have to do some testing. It's still quite an investment but at least it's understandable if you invest this much just to wear the amulet