Blood Rush is an uncommon Melee mod that increases critical chance as the Melee Combo Counter increases.



Stats[]


Rank

Effect

Cost

Effect at 12x


0
+3.6%
4
39.6%


1
+7.3%
5
80.3%


2
+10.9%
6
119.9%


3
+14.6%
7
160.6%


4
+18.2%
8
200.2%


5
+21.8%
9
239.8%


6
+25.5%
10
280.5%


7
+29.1%
11
320.1%


8
+32.8%
12
360.8%


9
+36.4%
13
400.4%


10
+40%
14
440%

Drop Locations[]

Mission Drop Tables

Enemy Drop Tables



Enemy

Drop Table Chance[4]

Item Chance[5]

Chance[6]

Expected Kills[7]

Quantity[8]

Avg. per roll attempt[9]

Sourced from the official drop table repository. See Module:DropTables/data to edit on the wiki.

Notes[]
Blood Rush multiplies critical chance based on the Melee Combo Counter tier increase.
Without a Combo Counter, Blood Rush provides no bonus to critical chance. At 2x, it increases critical chance by 0.40 × (2 - 1) = 40% and at 3x, it increases critical chance by 0.40 × (3 - 1) = 80%. At the standard max Combo Counter of 12x, it increases critical chance by 440%.
Blood Rush cannot be equipped on  Diwata,  Exalted Blade,  Valkyr Talons,  Iron Staff,  Desert Wind, or  Shadow Claws.
Pairs very well with  Body Count,  Drifting Contact,  Gladiator Rush, or The  Primary Dexterity &  Secondary Dexterity arcanes which allow players to keep the Combo Counter up more consistently.
Since thrown attacks from Glaive weapons are affected by the Combo Counter, they will also receive any bonus from Blood Rush.
Calculation[]
The formula for calculating the increased critical chance reached by the mod is as follows:

Crit Chance = Weapon Crit Chance × [1 + Mod Crit Bonus + Blood Rush Bonus x (Combo Multi - 1)] + Static Crit Bonus
For example, a weapon with 20% base critical chance, modded with maxed  True Steel (1.2) and Blood Rush (0.4), and with a Combo Multiplier of 4.0x would reach 20% × (1 + 1.2 + 0.4 × (4.0 - 1)) = 68% chance to crit.
The table below displays the critical chance that a melee weapon can achieve depending on its base critical chance and current combo multiplier.





Base Crit Chance

Difference Per Multiplier

Combo Multipliers (No Critical Chance Increase at 1x)


1x

2x

3x

4x

5x

6x

7x

8x

9x

10x

11x

12x


2

0.8

2

2.8

3.6

4.4

5.2

6

6.8

7.6

8.4

9.2

10

10.8


4

1.6

4

5.6

7.2

8.8

10.4

12

13.6

15.2

16.8

18.4

20

21.6


6

2.4

6

8.4

10.8

13.2

15.6

18

20.4

22.8

25.2

27.6

30

32.4


8

3.2

8

11.2

14.4

17.6

20.8

24

27.2

30.4

33.6

36.8

40

43.2


10

4

10

14

18

22

26

30

34

38

42

46

50

54


12

4.8

12

16.8

21.6

26.4

31.2

36

40.8

45.6

50.4

55.2

60

64.8


14

5.6

14

19.6

25.2

30.8

36.4

42

47.6

53.2

58.8

64.4

70

75.6


16

6.4

16

22.4

28.8

35.2

41.6

48

54.4

60.8

67.2

73.6

80

86.4


18

7.2

18

25.2

32.4

39.6

46.8

54

61.2

68.4

75.6

82.8

90

97.2


20

8

20

28

36

44

52

60

68

76

84

92

100

108


22

8.8

22

30.8

39.6

48.4

57.2

66

74.8

83.6

92.4

101.2

110

118.8


24

9.6

24

33.6

43.2

52.8

62.4

72

81.6

91.2

100.8

110.4

120

129.6


26

10.4

26

36.4

46.8

57.2

67.6

78

88.4

98.8

109.2

119.6

130

140.4


28

11.2

28

39.2

50.4

61.6

72.8

84

95.2

106.4

117.6

128.8

140

151.2


30

12

30

42

54

66

78

90

102

114

126

138

150

162


32

12.8

32

44.8

57.6

70.4

83.2

96

108.8

121.6

134.4

147.2

160

172.8


34

13.6

34

47.6

61.2

74.8

88.4

102

115.6

129.2

142.8

156.4

170

183.6


36

14.4

36

50.4

64.8

79.2

93.6

108

122.4

136.8

151.2

165.6

180

194.4


38

15.2

38

53.2

68.4

83.6

98.8

114

129.2

144.4

159.6

174.8

190

205.2


40

16

40

56

72

88

104

120

136

152

168

184

200

216


42

16.8

42

58.8

75.6

92.4

109.2

126

142.8

159.6

176.4

193.2

210

226.8


44

17.6

44

61.6

79.2

96.8

114.4

132

149.6

167.2

184.8

202.4

220

237.6


46

18.4

46

64.4

82.8

101.2

119.6

138

156.4

174.8

193.2

211.6

230

248.4


48

19.2

48

67.2

86.4

105.6

124.8

144

163.2

182.4

201.6

220.8

240

259.2


50

20

50

70

90

110

130

150

170

190

210

230

250

270



Crit Chance = Weapon Crit Chance × [1 + Mod Crit Bonus + Blood Rush Bonus x (Combo Multi - 1)] + Static Crit Bonus


A spreadsheet that performs the same calculation, and also allows to enter your Crit Chance % from Crit Mods and the CC% per combo, can be found online here.

Trivia[]
Prior to Update 26.0 (2019-10-31), Blood Rush provided +165% critical chance per combo level. Critical chance was calculated according to the following equation:
 Crit Chance = [Base Crit Chance × (1 + Mod Crit Chance) + Static Critical Chance Modifiers] × [1 + (Blood Rush Multiplier × Combo Multiplier)]
See Also[]
Gladiator Mod Set, which has a similar effect.
Weeping Wounds, the Status Effect equivalent.
Patch History[]

Update 30.5 (2021-07-06)

Melee Mod Nerfs
Blood Rush’s maximum value is being lowered. This changes the achievability of consistent Red Crits from just one Mod (on most Melee weapons, some High-Critical exceptions), and now additional help will be needed via Mods, Arcanes, or Warframe abilities to achieve consistent Red Crits. 
One Mod alone generally delivering the best tier of Criticals felt too powerful. 
Blood Rush is changing from:
+60% Critical Chance stacks with Combo Multiplier
To
+40% Critical Chance stacks with Combo Multiplier
Update 29.5 (2020-11-19)

Fixed Blood Rush not applying to Garuda’s Talons (only applies when Talons are the single equipped Melee).
Fixed return issue with combo stacking Melee Mods (like Blood Rush) not resetting while in Operator with a very specific loadout as Client, as reported here: https://forums.warframe.com/topic/1202616-blood-rush-still-bugged/
Update 29.0 (2020-08-25)

Now drops from level 30-40 Necralisk Bounties
Hotfix 27.5.5 (2020-05-21)

Fixed the Blood Rush Critical Chance boost not resetting when the Melee combo counter is reset.
Hotfix 27.5.4 (2020-05-20)

Fixed Blood Rush bonuses not resetting if you’re the Operator when the Combo expires.
Update 26.0 (2019-10-31)

Changed from multiplicative to additive with other mods. Now only multiplies base critical chance. Critical chance bonus went from 165% to 60%.
(Undocumented) Added buff icon.
Update 18.5 (2016-03-04)

Added as potential reward from Lua Spy missions.
Hotfix 18.4.1 (2016-01-25)

Added to the game as an event-exclusive drop from Operation: Shadow Debt.

Last updated: Update 26.0 (2019-10-31)



CollapseCritical Hit Mods Edit


Rifle

Chance

 Point Strike •  Critical Delay •  Argon Scope ( Galvanized)


Damage

 Vital Sense •  Hammer Shot •  Bladed Rounds


Shotgun

Chance

 Blunderbuss •  Critical Deceleration •  Laser Sight


Damage

 Ravage ( Primed) •  Shrapnel Shot


Pistol

Chance

 Pistol Gambit ( Primed) •  Creeping Bullseye •  Hydraulic Crosshairs ( Galvanized)


Damage

 Target Cracker ( Primed) •  Hollow Point •  Sharpened Bullets


Melee

Chance

 Blood Rush •  Maiming Strike •  True Steel ( Sacrificial)


Damage

 Gladiator Might •  Organ Shatter ( Amalgam)


Arch-gun

Chance

 Critical Focus •  Parallax Scope


Damage

 Critical Focus •  Hollowed Bullets


Arch-melee

Chance

 Critical Meltdown •  Tempered Blade


Damage

 Bleeding Edge


Weapon Augment

 Deadly Maneuvers •  Deadly Sequence •  Exposing Harpoon •  Hata-Satya •  Amalgam Ripkas True Steel



↑ Chance to roll item within drop table

↑ Amount rewarded on successful roll

↑ (Quantity × Chance)

↑ Chance to roll drop table

↑ Chance to roll item within drop table

↑ (Drop Table Chance × Item Chance)

↑ (1 / Chance), see WARFRAME Wiki:Expected & Nearly Guaranteed Numbers for more details

↑ Amount rewarded on successful roll

↑ (Quantity × Chance), average item quantity on a roll attempt (successful or not)