Yami's planet,, a doodle of it
Dreenia is a majorly cavernous planet. The surface of the planet is very dark and barren, with a few dark colored plants that survive with low oxygen. There are numerous ravines and cave openings on the surface of the planet that leads to the area of major biodiversity. The caverns where life is found is largely filled with gems and precious metals. There are several plant species that are bioluminesent, and provide the caves with light. Rather than getting energy from the sun, like earth, on Dreenia energy comes from the core of the planet, a molten ball of nuclear energy. Small holes allow streams of energy to flow into the oxygen they breathe, and generally plants are only able to harvest it.