Artwork from Metroid Prime
|First game||Metroid Prime|
Thardus is a boss creature in the Metroid series, first appearing in Metroid Prime for the GameCube (and later the semi-remake, Metroid Prime Pinball for the Nintendo DS). It's a large, hulking rock and ice monster that was formed from the major subject of the Prime series - Phazon. It is the major boss of the Phendrana Drifts stage, and quite a challenging one as well. This is partially due to the fact that your tracking device won't work when you need it most - during the part when he rolls up in a large ball and rolls around.
His weak spots would be nearly impossible to spot if Samus Aran hadn't in possession her thermal visor.
Once defeated, Samus would obtain the required Spider-Ball.