Create a highly detailed and realistic depiction of the character Cocytus from the anime series 'Overlord'. He should stand impressively, showing off his insectoid armor and icy demeanor.

A humanoid form of Cocytus from the anime Overlord, in a fantasy armor glowing with chilly icy blue light, wielding his signature weapon, the Decapitation Fang. His form should represent the inhuman strength and dignified warrior spirit.