I like it, but it seems a bit much, even with the drawbacks.. There's certainly a risk to it with the damage weaknesses in. I'm not the best at builds, and such, but what would the numbers look like with this equipped, and say....gobalski's, or brawler's belt? Hands of Dusk? Same conditions, but a barbarian with uuuuuhhhhh....Blazing Berserker, I think the feat is called? Those are the situations I can think of off hand where folk try to make the most use of the proposed amulet.
Item Name: Death Covenant
Item Type: Amulet
Appearance : iit_neck_005
Description: This eerie necklaces seems to be made out of wires and shaped bones, a grimacing skull etched unto one particularly big piece. Legends say that long ago, an unknown outlander tried to bargain with Death itself, pleading to be given the strength of the undead. Sacrificing his firstborn, he was given this amulet.....But Death failed to mention the curse upon the amulet. For he who would indulge in unlife, would also share in their weaknesses.
The outlander was not long after slain by an errant fireball of one of his companions, the fire proving lethal. And so Death laughed at another soul gained.
Whether or not this tale has truth in it, various copies of the original bone necklace have been found around the core, and wielders cannot help but feel a faint chill on their backs when wearing one.....
As if watched by an anticipating force....?
Statistics:
Immunity : Damage Type Piercing (25%)
Immunity : Damage Type Slashing (25%)
Damage Vulnerability : Damage Type Fire (50%)
Damage Vulnerability : Damage Type Divine (50%)
Damage Vulnerability : Damage Type Bludgeoning (50%)
Material : Bone
Cost: 1751
Even so, those items would only migitate the downsides, it wouldn't outright negate them.
Gobalski's bracer/Brawler's Belt : 50% Vulnerability means that it helps lessen hits that are for 10 bludgeoning damage or less....And even then, you still got hit for the ten initial damage. As the damage ramps up, it just gets worse for you : A usual maul user hits for 12 - 30 damage on average. With the amulet on, that's raised to 18 - 45 damage. Even with the DR, that's still an potential extra 10 damage on a regular hit.
Hands of Dusk: It would help reduce Divine Might strikes to normal damage. Average divine might damage is 5 to 8 Divine damage. Ramped up to 7 - 12 damage, a 5 DR would put it back around 2 - 7 damage.
However : Spells like Divine Hammer or Firestorm? Those will hit you like a -truck-. 5 - 40 divine damage for a regular divine hammer becomes 7 - 60. DR doesn't help much there. Considering how common both spells are in PvE......A legitimate issue with using the item!
Blazing Berserker : During the rage, you would not be affected by the fire vulnerability, yes. But you'd also have a 100% cold damage vumnerability. And if you pick the Frozen Berserker feat to cancel out the cold vulnerability, you then have the 50% fire vulnerability back during the rage. But again, -only- during the rage. If you get hit by fire when not raging, you're still as vulnerable as ever.
Also, something to consider : in PvE, it's not always clear what kinda damage a creature may do. Or, there's a mixed variety of weaponry, often times. In other words, a useful item, but still somewhat of a gamble.