Durendal

Its own damage is not the reason to hold it. Every hit refreshes a short attack speed buff, so the practical rhythm is to open on a target with this and keep cracking it often enough that the buff never lapses. The bonus applies to whips, which means a summoner carrying two of them alternates: this one to stay fast, a heavier whip for the bigger tag.

It also lands one of the larger tags available at its point in the game, which is why it pairs so well with the Blade Staff. Those minions swing constantly and hit for almost nothing on their own, so a flat bonus applied to each of their many small hits is worth far more than the same bonus on a slow, heavy summon.

The swing is long and catches several enemies at once with only a modest falloff per extra target, so it holds together in a crowd better than most whips do. The name comes from the sword of Roland, and the sprite leans into it: what you see is a blade rather than a cord, closer to a segmented urumi than a whip.