The mods involving killing poisoned enemies synergise well with the notable passive, Adder's Touch. Both the poison and regeneration effects on killing a poisoned enemy are spread in a medium-sized area, last 2 seconds. Poison effect spreads the largest Poison stack on an enemy to enemies around it and is stackable. This means that if you have three poisoned enemies each with two stacks all standing close together and you kill two, their largest poison stack on each slain enemy will spread to the third enemy, so the enemy will now have four poison stacks. While using Poison on Traps, Totems or Minions the "On Killing a Poisoned enemy" effect only works if the Poison kill the enemy.