A suit of jagged-edged black alloy armor

Auction Type: Manual
Auction Item: a suit of jagged-edged black alloy armor

You note the following details about a suit of jagged-edged black alloy armor:

It imparts a bonus of +50 more than usual.
It has been infused with the power of a corrosive substance.
It is an enhancive item:
    It provides a boost of 10 to Aura Base.
    It provides a boost of 1 to Spirit Recovery.
    It provides a penalty of -10 to Constitution Base.
    It seems to have a huge number of enhancive charges remaining.
It will persist after its last enhancive charge has been expended.
It appears to weigh about 38 pounds.
It is estimated to be worth about 433,800,000 silvers.
It is spiked.
It is predominantly crafted of black alloy.
It is a tricky project (482 difficulty) for an adventurer to modify.
It has some unknown (scripted) benefit.
The armor is plate armor that covers the torso, arms, legs, neck, and head.  It is spiked.
The armor can be worn around the chest.  The armor appears to serve some purpose.

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  |      |   |  __ <        |  |      |   |     ___ \   __ <   |   |  |   |  __ <
 \____| \___/  _| \_\ _____/  _____| ____/    _/    _\ _| \_\ _|  _| \___/  _| \_\

  This armor has been imbued by shadow four times, the most possible.

  Its tiny dark tendrils seem to undulate without bias.

  As it hungers for the spirit of the living, your ability to overcome adversity will be tested until
  it is satisfied with your commitment, after which your hard work will be rewarded.

  Wearing it is not without risk, and removing it is not without cost.  You can PULL it to sacrifice
  your spiritual tether for safe detachment.

  You can RUB the armor to gauge its hunger and TOUCH it to hush its presence.

  You sense some additional actions:
    BOW, CRACK, SCRATCH, RAISE, STRETCH, BREATHE, EXHALE

  When being altered, its appearance must remain suitable for its dark, cryptic nature.