Cataclysm

Cataclysm is a level 96 Mythic-tier dagger, requiring a minimum level of 96 and 120 Dexterity to wield. While it can be used to great extent in TWF Cataclysm, not being too glassy while almost always having over 14,000 Spin Attack damage; It comes with a massive downside of a 120 Dexterity Requirement and massive -HP to take place for it's high damage, but despite having these downsides, it is still one of the best mythics due to its massive damage.

Lore
"Despite the existence of the Nether Portal, few believe that it is possible to open such rifts with sheer force alone. None believe that a tool with enough power to accomplish such a monumental feat could exist. And yet..."

Trivia

 * Cataclysm is often considered to be one of, if not the single best mythic weapon, with its extremely high damage.