Tierra

Tierra is the secondary antagonist of the main-series "Yu-Gi-Oh!" card packs. It is a deity of rebirth and death, though it mainly focuses on the latter compared to its counterpart. Tierra is half responsible for the creation of the second world, along with being fully responsible for the creation of the Steelswarm.

Origin
After Trishula froze the world and the flow of time, Tierra and its counterpart Sophia came into existence and seeded the world's life again. Whereas Sophia wanted to create a world of stillness through peace, Tierra wanted a world of stillness through an absence of life. Thusly, it seeded the evils of the world, one being the pure evil Steelswarms.

Sophia didn't want Tierra's desire to ever come to fruition, so Sophia sealed Tierra in a machine underneath the Sacred Tree that regulated her energies throughout the planet. She then fragmented the core used to access the machine and hid its pieces away in a land that was nowhere near the tree. These fragments are the pyroxene would eventually bring the Gem-Knights to life.

Corruptive Influence
Though Tierra was trapped, it still had hope of escaping from the Sacred Tree. When the Lswarm virus mutated into the Shaddoll Virus, Tierra was able to take control of all beings who were infected by it. Its master plan was to use the Shaddoll Virus and Gem-Knight Lapis' power of creation to free itself and make a powerful body with which to destroy the world.

Tierra had managed to take control of Lapis by creating the Construct around her as its enforcer. However, a problem arose when it discovered Lapis was dead, so it needed to bring Lapis back to life before it could destroy the world. It had Shaddoll Winda attack the Sacred Tree to make getting free easier, but before Winda or the Construct could do any real damage, the "Apoqliphort" program activated and the Tree started defending itself from them. Winda was subdued by a Qliphort Scout, while native lifeforms attached the Construct to Apoqliphort Towers and then froze them both.

However, the defenses made an error by absorbing Winda, which allowed Tierra to hack their programming and spawn new servants: the Infernoids. Exactly 9 Infernoids were dispensed to try and destroy the Sacred Tree, but the native lifeforms managed to destroy them. One Infernoid was tasked with using the power of the Ice Barrier dragons to unfreeze the Construct. It succeeded, although the Construct was no match for Tellarknight Ptolemaeus. Ptolemaeus shattered both Devyaty and the Construct, although they both survived being ripped apart.

Infernoid Decatron (Devyaty's head) discovered Tierra's body in the Sacred Tree and hacked the machine's system to let Tierra loose. Teirra then used its Necromancy to bring Gem-Knight Lapis back to life inside the Construct. With its newfound power to create, the Construct fused with Tellarknight Ptolemaeus and Infernoid Decatron as preparation for Tierra's ultimate form. Meanwhile, Tierra went and devoured the bodies of the dead Infernoids and Apoqliphort Towers to gain their remaining energy. Tierra combined itself with the Construct to transform into Tierra, Source of Destruction. Due to the full rebirth of Tierra, the machine under the Sacred Tree started glowing with the power of the pyroxene. The machine revived Cairngorgon and the Shaddoll Core and merged them with the 10 pyroxenes, creating Zefraath. Zefraath and Tierra then fought a battle that lasted for over 3 years. In the end, Tierra is finally destroyed along with the Construct.

Personality
Being a machine, Tierra has no qualms about destroying life, nor does it understand why life even needs to exist. It is cold and harsh in its actions, and it doesn't regret standing by its convictions.

Powers and Abilities
Initially, Tierra is presented as being powerless, seemingly having no influences on anything due to being trapped. However, even while trapped it could take full control of beings infected by the Shaddoll Virus and upload regular computer viruses to regular machines through interaction with the Shaddolls.

As a deity, Tierra controls life and death in their individual forms. Though it prefers to destroy, it has the ability to bring other beings back to life. As Infernoid Tierra, it also had pyrokinesis and could infuse it's power of death into its flames to make them lethal upon contact. As the Source of Destruction, Tierra had increased strength due to adding Apoqliphort Towers onto its body.