Nemirtvi's Skull Goblet
Skull of a royal humanoid
While the construction of this cup is superlative, the magnificence of its craftsmanship is turned wicked by the grotesque gold-crowned humanoid skull that makes up its bowl. When you use this spellcasting focus to consume Supply during a long rest , you gain a 1d8 expertise die on your next Arcana or Religion check. After making this check, you make a Charisma saving throw (DC 1 + 1 per previous use of this property) or gain the Evil trait (making you radiate an aura of Evil).
In addition, once per day you can place the blood of a creature that has died within the last hour into the goblet and drink from it. You instantly experience the last 10 minutes of the creature’s life through its senses, and you have disadvantage on your next Charisma saving throw against Nemirtvi’s skull goblet