Silent Death

The Silent Death is a or  Dungeon Sword rarely obtained from killing Shadow Assassins on Catacombs Floor 3 or higher. Using this sword requires level 20.

The ability teleports you behind the mob you're looking at. It requires no mana and due to it “homing” on the mob you're looking at, it is much more consistent than the Aspect of the End. After killing a mob with the sword's ability, the cooldown is reset. This ability can be used for farming Summoning Eyes. This ability is also very good for testing max damage or when you are attacking a single mob because you get 25 Strength on use. The ability is the same as the Enderman class's skill from Mega Walls, although it shares the name of Assassin's first passive (the difference being that Assassin's ability is activated when hit rather than on demand). Potential usage for clearing rooms with its 0 cooldown post kill.

Resetting the cooldown doesn't require you to actually kill with the Silent Death. using any weapon to kill a mob works at resetting it's cooldown.