Outer Essence Shard (Evil)
Wondrous item, spellcasting focus, rare (requires attunement by a sorcerer)
- Weight: 1.0 lbs.
This flickering crystal holds the essence of an Outer Plane. As an action, you can attach the shard to a Tiny object (such as a weapon or a piece of jewelry) or detach it. It falls off if your attunement to it ends. You can use the shard as a spellcasting focus while you hold or wear it.
When you use a Metamagic option on a spell while you are holding or wearing the shard, you can use that property.
Property
Choose one creature who takes damage from the spell. That target takes an extra dice:3d6|noform|noparens|avg (3d6) necrotic damage.
Source: Tasha’s Cauldron of Everything p. 133