How to overkill with some low damage weapons?

[Loxim]

I've got a couple Fracture challenges to overkill targets with scythe, lightning gun, and rapier. I can't for the life of me get these done. The scythe has a wide margin for damage from low to high, and no big hit ability. The lightning gun is low damage channeled over time, but still really strong, but all the overkills I get with it are random. And the rapier, it's bleed attack doesn't seem to be hitting hard enough ever. I've been setting up the enemies with vulnerable right before and nothing. Maybe I'm just getting unlucky?

[Venuminostrates]

So a couple of ideas.

Clear the room of the monsters that don't need to be overkilled. Inch down your target's health so that it is low but do not kill them. Then activate Liquid Madness potion or Berserk Aura, or better yet both, and then use the highest hitting ability for the weapons on the low health monster.

My second idea is to stack Executioner cards. These make you do extra damage when they are below 50% health which makes them easier to overkill. You may or may not have the cards to do this.

[Loxim]

Hmm, yeah I've got one yellow executioner card, so I'll have to keep a look out on the vendors for some more. The problem with lightning gun though is that the lightning orb doesn't hit super hard, but it does hit a lot when you have lots of orbs. And when the enemy I'm trying to kill spawns in groups of 5 or more, not killing them is pretty tough. I'll keep trying see what happens.