Durendal

The Durendal is a Whip crafted from 12 Hallowed Bars at a Hardmode anvil. If the whip continuously strikes an enemy, its attack speed will noticeably increase for a short time. This bonus will continue to occur even if the player switches to another whip or melee weapon via the Durendal's Blessing buff.

Trivia

 * This item's name is in reference to a real sword of the same name,, that is stuck in a cliff side in Rocamadour.
 * Although the icon looks like a sword, this weapon is a whip of substantial length. When used, the sword pieces separate, connected by a red wire or rope.