A Yalexian Pearl is an item belonging to a creature known as a Yalex, and the pearl serves as an eye for a Yalex to see with.
The Yalexian Pearl grows inside the Yalex's thorax and once it's fully formed, it breeches the skin and provided the creature with 360 degree vision. The Pearl is invaluable to the Yalex because without it, they are rendered vulnerable to animal poachers and developers who seek to make Yalex moons habitable for other species. They have eight, purple glands which shoot purple lasers as a mechanism to defend the Pearl. The immense danger aquiring the Pearl poses is what makes it so valuable.
- Lance once mentioned the Yalexian Pearl in the episode "Monsters & Mana".