Cursed Dart

The dart itself travels and can clip a second target. As it goes it sheds green flame that drops to the floor and burns for a moment. Those flames are weaker than the dart, they cannot pierce, and they only sit where the ground happens to be. Against a crowd walking at you along flat terrain that carpet does real work. Against a flier or a boss in open air most of it lands on nothing.

Ichor Dart strips defense, which multiplies every other source of damage you are carrying. This one applies a burn and covers floor space. For single target output the Crimson dart is usually ahead, so in a Corruption world plan fights on ground you control and let the flame trail do the work the debuff cannot.

Frost armor stacks its debuff onto the dart but not onto the flames it leaves, so the trail is doing plain damage no matter what set you wear.