Cilice of Joyful Contemplation

DM's note:  This item was created on the request of my player.  His backstory involved escaping a particularly vicious Annis Hag, and swiping an infernal puzzle box as he made his exit.  Given the nature of the box, as well as its previous owner, I knew that whatever it contained had to be a Big Deal.  I also knew that whatever it was, it had to be something that no normal human being would feel comfortable using.  After finally solving the puzzle that bound the box shut, this is what he found.

Wondrous Item, Rare, Requires Attunement, Requires Non-Good Alignment

The barbed chains that comprise this harness look like they would make donning it near-impossible.  Nothing could be further from the truth, however.  They always fall and slide across your body in just the right way, never getting tangled or bound.  It's as if the chains want you to wear them.

Despite the risk of ruined flesh and scars, many have sought the cilice before the Order of Boryslav the Lionhearted sealed it away under a magical binding.  The price of blood is more than offset by the uncanny resilience it offers the wearer.

The cilice of joyful contemplation is a harness of cruelly hooked chains that you may wear under any armor or clothing.  The hooks are short, but razor sharp, and cover your torso.  You will take an additional 1d4 points of damage every time you take damage from a weapon or spell that deals bludgeoning, piercing, slashing, or force damage.  Additionally, any magical healing that you receive has its effectiveness halved.

While you wear the cilice of joyful contemplation, you do not need to breathe, nor eat, nor drink.  When your current hit points are below half your maximum, you regenerate one hit point per round until you reach half your maximum hit point total.  If you take radiant damage, or damage from a silvered weapon, thsi trait doesn't function until the start of your next turn.  You will only die if you start your turn with 0 hit points and do not regenerate.