Emerald Chalice

This item was made by master Dwarven artisans, hollowed our from a single colossal emerald. It was given to an Elven kingdom as part of their peace treaty over the issue with their gift of a Dwarven lock many centuries ago. Statistics: any liquid poured into this cup is purified and cleansed from any poison, disease, or impurity. This does *not* remove alcohol, but actually fortifies it, making almost twice as strong, regardless of its original strength.
The Dwarves intended this function to show off their drinking capacity and make fools of their hosts, but were surprised when the Elves supplied their own warm and fragrant clear cordial, which they called Miruvor, and drank several of the Dwarves under the table with it. This helped cement the peace treaty.