- Cost: 20,000
A creature created by Spacegodzilla's crystals and the magma of earth's volcanoes, Obsidius joins the mutants to absorb the energy in the crystals.
Obsidius has a good defense and attack but poor long range attack and speed. Obsidius can roll into a ball like Anguirus. Obsidius's stats in story mode are incorrect.
Using the Global Defense Force Faction, play the "Big Trouble" stage at Seattle. At the volcanic area, destroy the two cone shaped crystals down where the lava meets the water then complete the level. Afterwards, select "Birth of Obsidius" at Seattle and defeat the monster to add him to the shop.