You've secured the crown jewel of your collection: a lich's soul jar, or "phylactery." Though the original owner's soul has been expelled from this accursed artifact, it retains many of its magical properties.
This magic item is always attuned to you and doesn't count against your total number of attuned magic items. It has 5 charges and regains 1d4 + 1 expended charges daily at dawn. While wearing the soul jar, you can expend one or more charges to use the following abilities.
Temporary Hit Points
You can expend 1 charge as a Bonus Action to gain Temporary Hit Points equal to your Investigator level.
Trinket Recharge
You can expend 1 charge as a Bonus Action to regain one expended use of your ValdaSpire24.
Undead Fortitude
When you are reduced to 0 Hit Points and not killed outright, you can expend 2 charges to drop to 1 Hit Point instead. You can use this benefit only once per turn.
Draining Touch
As a Magic action, you can expend 3 charges to make a melee spell attack. On a hit, the target takes 8d8 Necrotic damage and you regain Hit Points equal to the Necrotic damage dealt. If the spell attack misses, these charges aren't expended.