Primary Merciless is a Primary Arcane Enhancement that on kill increases primary weapon damage for 4 seconds and stacks up to 12 times. At max rank, it also passively increases reload speed and ammo maximum.

Can be sold for Credits64.png 1,000.


Rank Damage per Stack Total at 12 stacks Reload Speed Ammo Maximum
0 5% 60% - -
1 10% 120% - -
2 15% 180% - -
3 20% 240% - -
4 25% 300% - -
5 30% 360% 30% 100%


Awarded for defeating Acolytes in The Steel Path.

Source Chance Expected Nearly Guaranteed
Arcane 16.67% 5 – 6 kills 38 ± 13 kills

All drop rates data is obtained from DE's official droptables.

Expected refers to total number of attempts a player can expect to need in order to receive at least one of each drop associated with the respective values.
Nearly Guaranteed refers to the total number of attempts a player needs to obtain a 99%, 99.9%, and 99.99% probability to receive at least one of each drop associated with the respective values.

For more detailed definitions and information on how these number were obtained, visit here.


  • When the buff times out, one stack is lost and the buff duration resets.
  • Ammo Maximum has no effect on battery weapons, such as CorpusLaserRifle.png Flux Rifle or Kitguns equipped with PaxCharge64x.png Pax Charge. The reload bonus however, will boost the recharge rate of ammo recovered.


  • Useful on weapons that can already kill groups of enemies quickly, such as most explosive weapons or weapons that chain between targets. Less useful on slow firing weapons that rely on status effects to kill their targets like single shot rifles.

Patch History[]

Update 30.5 (2021-07-06)

  • Introduced.