This enemy often appears alongside Hydra whose Japanese name also literally translates to "Hydra". That Hydra's Japanese name is the Japanese name for the Hydra, more resembling the original Greek pronunciation. Ghidra's Japanese name derives from the English pronunciation of "Hydra". This also has a double meaning, as the first part of the name is pronounced the same as the word "high", which is why Ghidra appears as a stronger version of the Hydra.
Ghidra is an enemy fought at Ronka Ruins alone and can also be fought in the battle with an Alchymia. It is a dangerous foe as it has Auto-Reflect and battles using Poison Breath and Lightning. It is the earliest that the Blue Magic spell, Level 4 Graviga, can be obtained, and it has the Killer Bow to steal (Ronka Ruins only). If caught by a Beastmaster's Catch ability, it will cast Earth Shaker when released (Earthquake if caught from the Alchymia battle).
The Hydra boss encountered in the trial "A Relic Reborn: The Hydra" uses the "Haidora" spelling usually reserved for Ghidra in the japanese localization, as does the Lesser Hydra enemy encountered in Azys Lla.
Hydra was one of the spawn of Echidna, a many-headed serpentine monstrosity in Ancient Greek mythology. It could breathe poison, and indeed its very blood was deadly. The Hydra was killed as one of Heracles's Twelve Labors.The