Jsk Wondrous Items:Warrior Priests Weapon

Source: Jnome's Secret Knowledge

Weapon (Any), Rare (Requires Attunement)

An apple-sized alabaster sphere that hides a secret. When a creature first attunes to this weapon, it takes the shape of any simple weapon or martial weapon that the owner wants. The weapon is an alabaster white with gilded silver accents, complete with an embedded diamond surrounded by celestial engravings and runes. This weapon can be used as a spellcasting focus for spells. When you make an attack with this weapon and kill a creature, the diamond glows a soft silver. While the diamond glows, you can use the weapon as a focus to cast the Cure Wounds spell at its lowest spell level without expending a spell slot. If you do not have a spellcasting ability score, then you can choose Intelligence, Wisdom, or Charisma as your spellcasting modifier when you attune to this weapon for the purposes of resolving the effects of this weapon. When you cast a spell using this weapon, the diamond stops glowing, and it cannot glow again for the next hour.