Darkmote

You create a tiny mote of ineffable darkness the size of a marble in the palm of your hand. This mote has three benefits, which each last for the duration of the spell, but you may only gain one benefit from a single darkmote at a time:

• If consumed, it grants that creature advantage on Dexterity skill checks, the creature can take the Dash, Disengage, or Hide action as a bonus action on their turn, and their melee attacks deal an additional 1d6 necrotic damage on a hit. However, the creature's skin turns pale, their eyes appear as black orbs, and wisps of shadowstuff spill from their mouth as they speak.
• If held in a clenched fist, it can be used as a spellcasting focus and causes the wielder's spells to deal an additional 1d6 necrotic damage on a hit.
• If thrown at a space within 30 feet, the mote explodes on impact with a hard surface, blossoming into a 5-foot-radius sphere of necrotic energy. Any living creature caught within the area on impact, or begins or ends its turn there, must succeed at a Constitution saving throw or take 1d6 necrotic damage, half as much on a success. This spell has no effect on constructs or undead.

At Higher Levels. Every two levels above 3rd level that  you cast this spell, you may create an additional mote and the necrotic damage increases by 1d6 to a maximum of three motes and 3d6 damage at 7th level.