Name: Negative Shard or Death Shard
Description (like on staff event tickets)
Eating this will take away hearts temporarily.
Thoughts on the texture:

Gray Version of life shard
When you die, you gain a heart back, or eat a normal life shard
To obtain: Get then from arena bosses at the rarity of panda spawn eggs ONLY from vampires and wither skeletons.
Or get them from infusing 4 onyx with a life shard in an infusement altar to get them. Or instead of 4 onyx, 4 tourmaline if you want it to be difficult to get
