- Order: Saurischia
- Suborder: Wyvern Feet
- Infraorder: Strange Wyvern
- Superfamily: Poison Strange Wyvern
- Family: Nox
Baleful Gigginox, just like Gigginox, is apart of the Flying Wyvern classification. Baleful Gigginox is a genetic defect of Gigginox that has adopted the Thunder Element from its ancestors, just like Khezu, yet it can't reproduce like a normal Gigginox.
Like normal Gigginox, the Baleful Gigginox lives mainly in the freezing caves of the Tundra.
The Baleful Gigginox are active predators. It actively preys on Bullfango, Anteka, and Popo. Tigrex, Deviljho, Barioth, Great Baggi, Glacial Agnaktor, Stygian Zinogre, and Brachydios consist of the fierce competition these Gigginox must contend with. Despite competing with such formidable competition these wyverns are far from defenseless as their electrical attacks are powerful enough to stun a Barioth.
Baleful Gigginox has golden-colored skin due to its genetic defect. This skin is similar to the ancestor of it, and Khezu, though changes to a blood red color when enraged. Where its poison organs should be, is where its electrical organs are. These special organs come from its ancestors, which once used them to capture and paralysis prey. The electricity from Baleful Gigginox is powerful but, can easily be stopped by damaging its exposed electrical organs. Like Gigginox, Baleful Gigginox have the ability to lay egg sacs. The egg sacs of Baleful Gigginox are infertile, meaning there are no Giggi that can hatch from them, and used as a weapon to protect itself. Baleful Gigginox egg sacs are highly explosive, though leave behind a shock of lightning.
Baleful Gigginox are aggressive monsters that actively travel outside the caves of the Tundra for food.