Kelemvor's Shroud

As an action you can activate this ring to become invisible for 1d6 minutes OR you may activate this ring to imbue your weapons with the power of Kelemvor. On a hit deal 2d10 Necrotic damage and heal for half that amount rounded down. This can only be used once per day.
You have advantage on all attacks against Undead creatures and death saving throws. On a successful attack against an Undead creature, add an additional damage die to the roll.