Dark Harvest

Mark an enemy with the whip, then let a minion or a sentry hit it, and the damage sprays outward onto everything standing near it. The chain measures from the marked enemy rather than from you, and it hops from one target to the next, so a line of enemies down a corridor can carry the effect well past your own reach. The mark is not spent when it fires either. You crack once and your summons keep cashing it in for as long as it lasts.

Every separate hit a minion lands on a marked target is another trigger. Summons that strike several enemies per attack multiply the output enormously; single target minions waste most of the mechanic. Build around that and this becomes the strongest crowd whip in the game outside of two very late options.

Against one enemy all you are getting is the tag damage and the attack speed buff, both of which cheaper whips match. Keep a second whip for single target fights and save this one for the moons, eclipses and invasions, which is where the drop comes from anyway.

The attack rate bonus expires quickly and refreshes on every hit, so it rewards constant swinging rather than opportunistic cracks. If you are dodging more than you are attacking, you will rarely see it.