Oceana

Oceana (オセアナ), also known as the Stubborn (頑固な) is one of the two main antagonists of Thunder Shock and the third main antagonist of the series, along with Firebrand. She appears briefly in Lightning Shock.

She is a super ancient being that was initially part of a greater collective along with Firebrand and Terraria. After being defeated by Lucas, Oceana went into a state of hibernation until 2020, where she awakened and resumed her conflict with Oceana. This caused the two of them to encounter Sapphire and Ruby in the Easton region, and was eventually sealed within the Water Crystal.

In 2022, Oceana fused her soul with Sapphire from within her prison, allowing the latter to use her new power to help Ruby (who also fused his soul with Firebrand) unleash Terraria from the Earth Crystal. Several decades later, Oceana's soul was passed on to Sapphire and Ruby's son, and later to their grandson Raiden.