A number of times per Long Rest equal to the Tier of the armor, you can use a Free Action immediately after you take damage to be affected by Greater Healing. The healing granted by this effect depends on the Tier of the armor, not your Tier.
When you use this ability, you can spend 1 charge of either Inspiration or Mana Flux to make a Basic Melee Arcanite Attack against any number of creatures within 5 feet of you, dealing 1d8 Fire damage on a Hit. You can spend additional charges of Inspiration and/or Mana Flux to increase the radius of the effect by +5 feet per additional charge spent this way.