Primary Merciless

Primary Merciless
Tradeable
📝 Update Infobox Data
Max Rank Description
On Kill/Passive +30% Damage for 4s. Stacks up to 12x. +30% Reload Speed
General Information
Type	Primary
Rarity	Rare
Refreshable	✔️
Max Rank	5
Arcanes Required to Max	21
Dissolution	20
Trading Tax	8,000
Introduced	Update 30.5 (2021-07-06)
Vendor Sources
Official Drop Tables
https://www.warframe.com/droptables

Primary Merciless is a Primary Arcane 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.

Can be sold for 1,000 Credits 1,000.

Effect

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

Acquisition

Awarded for defeating Acolytes in The Steel Path.

Item	Source	Chance	Expected	Nearly Guaranteed
	Mania	16.67%	~ 5 Kills	37 ± 12 Kills
	Angst	16.67%	~ 5 Kills	37 ± 12 Kills
	Violence	16.67%	~ 5 Kills	37 ± 12 Kills
	Torment	16.67%	~ 5 Kills	37 ± 12 Kills
	Misery	16.67%	~ 5 Kills	37 ± 12 Kills
	Malice	16.67%	~ 5 Kills	37 ± 12 Kills

All drop rates data is obtained from DE's official drop tables. See Mission Rewards#Standard Missions for definitions on reward table rotations.
^{For more detailed definitions and information, visit here.}

Notes

• When the buff times out, one stack is lost and the buff duration resets.

Tips

• 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 32.0 (2022-09-07)

• Primary Merciless Arcane: Removed its +100% Ammo Maximum bonus.

Update 30.5 (2021-07-06)

• Introduced.