The shard sliver of Lust embues the wielder with properties of Lolth, The Spider Queen. But with persuasive presence comes an insatiable need for touch...
When touching or being touched by another creature, the bearer of the sliver must succeed on a DC 18 Charisma Saving Throw, or else forcefully cast Vampiric Touch at the creature. The bearer may choose to end concentration on their own volition. Should the target be brought to 0 HP, the damage rolled is added to the bearers temporary hit points.