Obsidius (オブシディウス is a volcanic Obushidiusu)kaiju created by Atari, Pipeworks and Toho that first appeared in the 2007 Godzilla video game, Godzilla: Unleashed. He was chosen for the game through an IGN readers' poll, defeating The Visitor, Fire Lion, and Lightning Bug with 37% of the votes.
Obsidius' name comes from "obsidian," a type of volcanic glass. It was chosen by a second IGN readers' poll after he was voted into the game, prevailing over Pyrodorah, Kazango, Dotoryo, and Volcanis. During the original poll, he was called Magmouth.
Originally, according to art director Robert Caracol, Obsidius "was a combination of two separate concepts. The first was a rocky, craggy creature that was basically solid rock. The second was more akin to flowing magma. In the end, we came up with a blending of the two ideas, arriving at a monster that was a walking volcano. It possessed the hardness and sharpness of solid granite but could also attack using the molten fluid from within its body." Obsidius' design did not change much from there. Its colors range from a dark brown to charcoal black, and then its magma ranges from yellow to orange. It has three horns at the back of its head, no eyes, no mouth features—other than a hole similar to a throat where magma can be expelled from—and no real features other than rocky skin and thin lines of magma where articulation is required, like the joints of the arms, legs, neck, tail, and feet.
Obsidius is made of volcanic rock, making him resistant to many attacks. He is immune to lava, and so can run around in the lava pools on the Seattle arena in the game. He can curl himself into a ball and roll around at high speeds. Many of Obsidius' attacks are similar to a gorilla and Orga, with his huge arms and flexible legs playing a huge role in his fighting style. Obsidius also has the ability to spit out burning lava (this attack is known as "Inferno") and burrow underground.
- Godzilla: Unleashed (2007) - Nintendo Wii and Sony PlayStation 2
"Although most of the crystals deposited on Earth by the meteor showers (sent by SpaceGodzilla in order to escape from his prison in Godzilla: Save the Earth) embedded themselves in the surface, some of them managed to punch through the earth's crust and enter the lithosphere. There, brought together by the magma flows from within the earth, a sentient creature was brought to life by the accumulated power of the crystals and the raw, ferrous materials of the earth. Obsidius emerged from a volcano onto the surface world only recently in conjunction with fellow mutant Krystalak, and thus far has resisted all attempts at communication. His virtually impenetrable mineral exterior shields him against both physical and energy assaults. He advances single-mindedly toward the most unstable crystal formations on the surface, and as such should be considered extremely dangerous."
- Obsidius' roars are stock sound effects performed by Frank Welker for The Land Before Time, though Simon Strange has stressed that this was not done deliberately.
This is a list of references for Obsidius. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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