The Frost Heart is neither equipment nor an enhancement crystal, or any kind of material or embedded gemstone. It's simply a consumable item, its sole function being to increase the user's Wind and Water Element Pool capacity by five percent, though it only works for the same person once.
This is undoubtedly the spoils of war that Brand currently needs the most.
It's even a crucial part of his path as a Travel Mage, something even Tu Men couldn't imagine—equipment, special items, enhancement consumables, enhancement crystals. In the Vorn World, there are many items similar to Frost Heart or Flame Star that can expand the Element Pool—of course, for balance reasons, besides a few divine artifacts and antiques, similar magic items or fantasy items don't have a large effect on the Element Pool.
But don't forget, Brand is special.
