Basaltforge Armour

Armour (any heavy), uncommon (optional attunement)
  Angular black metal plates adorn this robust and strangely quiet armour. Sported by the controversial Basaltforge agents of Dulhjelm, this armour enhances the dark dwarves’ innate ability to turn invisible by rendering them entirely silent.
  If this item normally confers disadvantage on Dexterity (Stealth) checks, the basaltforge version doesn’t.
  Optional Attunement. If you choose to attune to this armour, it gains the Hush property while you remain attuned to it. The item has 3 charges and regains all expended charges daily at dawn.
  OA: Hush. As a bonus action you can expend 1 charge to create a 5-foot-radius sphere of magical silence centered on you that moves with you. This effect lasts for 10 minutes or until you dismiss it as a bonus action. For the duration, creatures that can’t see you have disadvantage on Wisdom (Perception) checks made to spot you.
  Rare variant: Increase the number of charges to 5. The item gains the Shift optional attunement property:
  OA: Shift. As a bonus action, you can expend 2 charges to gain the effects of the enlarge/reduce spell for the next 10 minutes.
  Very rare variant: Increase the number of charges to 7. The item gains the Shift and Stone optional attunement property:
  OA: Stone. As a bonus action, you can expend 4 charges to gain the effects of the stoneskin spell for the next 10 minutes.