Abyss is a character in Bakugan: Defenders of the Core. She is considered the goddess-guardian of the Earth's "core", and was the one responsible in alternate Bakugan Interspace to take the Player to her reality.
She is the alternate Earth's "core". She seems to get power from landmarks and holograms. Also, she grows weaker as landmarks are destroyed and Vexos crystals are made. She eventually dies during the battle at the Earth's core, when the player was forced to kill her because Maxus Helios was becoming too powerful by using her as a power source. Later, after you defeat Maxus Helios, Abyss is reborn and she allows the Battle Brawlers to brawl. Throughout the story, she evolves your Bakugan. She first evolves Neo Dragonoid into Cross Dragonoid, then the player chooses a Bakugan to evolve one at a time after a level.