This weapon came out with the release of PvP worlds. It requires level 20 Attack and lasts only for 15 minutes of wielding. After the time is up, the warhammer will vanish.
The instant this weapon is wielded it will degrade. Once this weapon has degraded it will have the word (deg) added to its name and it becomes untradeable. Using this item in combat adds the (deg) to its name instantly, also rendering it untradeable.
As each 15 minutes contain 1500 ticks and the hammer hits once per 6 ticks, you are able to hit 250 hits with this hammer before it degrades. Thus, each hit costs approximately 810.9 when using this hammer.