The humanoid form of Onox, who is encased in nigh-impenetrable golden armor, is that of a man of huge stature, more than four times Link's size; furthermore, he possesses immense physical strength. He uses his strength, attributes to his advantage in battle, his weight alone having the power to make a roof collapse and damage his opponent. In battle, Onox uses a ball and chain, which he wields with considerable ease. He also possesses the ability to summon whirlwinds and tornadoes in battle, and even manages to somehow use one to "conceal" himself when he kidnaps Din. In his true form, that of a Dark Dragon, Onox attacks with his claws and breathes different types of fireballs at Link; in this form, he is impervious to damage, except attacks directed exactly at his weak spot, namely, the jewel embedded in his forehead. Notably, the humanoid form of Onox closely resembles the typical design of an Iron Knuckle, and it is possible he may be somehow related to these enemies.