Cyclopean helmet

The Cyclopean helmet is a reward from the Warrior's Guild.

This appears to be what a cyclossus is wearing on its head.

It can only be dropped by the Cyclossus, which has a combat level of 156 and is located in the Warriors Guild. It is cosmetic only .

Glitches
A few glitches have been spotted when wearing the helmet. These involve the chat text and life points bar floating higher than they normally would. Currently, the Cyclopean helmet is available in Free-to-Play servers, and is also listed in the Free-to-Play Grand Exchange (thus, able to obtain in free worlds by trading) despite being only obtainable in Member's worlds. It is unknown if this is intentional or not. If this were intentional, it would have the effect of increasing overall demand (and thus, the ultimate market price and value of the helmet).