The White Swallow Gems were the size of ping-pong balls, some circular- and some diamond-shaped. They were completely sparkly, running about in the murky underground like little sprites.
They were very mischievous, teasing these people by revealing themselves for but the briefest of moments before slinking out of sight. Soil, rocks, and metal; nothing impeded them.
White Swallow Gems were definitely not alive and were merely glittering pieces of crystals, with Xia Fei clueless about why they had the playful nature of sprites, everyone in the Law Realm knew, after millions of years of research by intelligent people, that using these White Swallow Gems could increase their cultivation levels, which was how the value of these seemingly living sprites, which lived underground, had increased exponentially, becoming the priceless treasures that all warriors dreamed of owning.