The only remnants of Hydro Tulpas after their parts are dispersed.
This substance is very similar to the crystals extracted from the bodies of Fontemer Aberrants, but they contain a lot of tiny impurities, like the bubbles in glass crafted by clumsy craftsmen.
They don't look as smooth as the Transoceanic Pearls from the Fontemer Aberrants, but have incredibly sharp spikes extending in all directions. However, instead of appearing dangerous or aggressive, these spikes look as though they wish to escape the center of the crystal, or stretch out and extend in all directions.