Deadly Strike

Equipping item(s) with this stat gives a chance to double physical attack damage when successful, even when barehanded.
Since conversion of physical damage to another damage type occurs after it is applied, it can also double the converted damage of the following:
- Magic Arrow
- Fire Arrow
- Cold Arrow
- Lightning Bolt
- Fists of Fire
- Berserk (both the skill itself and its synergy to Concentrate and Frenzy)

Does not apply to the following:
- Impale
- Dragon Talon
- Dragon Tail
- Dragon Flight
- Sacrifice
- Smite

Mutually exclusive with Critical Strike and weapon Mastery or Claw Mastery critical strike: if one is successful then the others don't apply. Combined % chance of double physical attack damage is as follows:

Two sources	100 - (100-DS)*(100-CS)/100
Two sources	100 - (100-DS)*(100-MCS)/100
Three sources	100 - (100-CS)(100-DS)(100-MCS)/10000 [1]

Non-player units like a Barbarian hireling, Valkyrie and Iron Golem have 5% chance of applying critical damage, doubling all attack damage types. This is calculated independently of other sources, so there is a chance of applying quadruple physical damage. Combined % chance of double physical attack damage only is as follows:

Two sources	5+(0.9*DS)
Three sources	100 - 0.95(100-CS)(100-DS)/100 - 0.05(100 - (100-CS)(100-DS)/100)

% Chance of quadruple physical attack damage is as follows:

Two sources	0.05*DS
Three sources	0.05(100 - (100-CS)(100-DS)/100)

Source

Helm

Template:D2 Skill bonus |- |(5-10) !align=left|[[D2 Crafted item#Blood|Template:D2 Crafted]] |13 |No |- |15% !align=left|[[D2 Orphan's Call#Guillaume's Face|Template:D2 Set]] |34 |No |}

Amulet

Template:D2 Skill bonus |- |0.375*clvl !align=left|[[D2 Unique amulet#Highlord's Wrath|Template:D2 Unique]] |65 |No |}

Weapon

Template:D2 Skill bonus |- |20 |align=left|[[D2 Rune|Template:D2 Crafted]] in weapon |59 |No |- |20 |align=left|[[D2 Rune Word weapon#Fortitude|Template:D2 Unique bold]] weapon |59 !Yes |- |20 |align=left|[[D2 Rune Word weapon#Phoenix|Template:D2 Unique bold]] weapon |65 !Yes |- |20 |align=left|[[D2 Rune Word#Hand of Justic|Template:D2 Unique bold]] weapon |67 |No |}

Melee weapon

Template:D2 Skill bonus |- |33 |align=left|[[D2 Rune Word weapon#Fury|Template:D2 Unique bold]] melee weapon |65 |No |- |25 |align=left|[[D2 Rune Word#Honor|Template:D2 Unique bold]] melee weapon |27 |No |}

Missile weapon

Template:D2 Skill bonus |- |20 |align=left|[[D2 Rune Word weapon#Brand|Template:D2 Unique bold]] missile weapon |65 !Yes |- |20 |align=left|[[D2 Rune Word weapon#Ice|Template:D2 Unique bold]] missile weapon |65 !Yes |- |25 !align=left|[[D2 Unique Normal crossbow#Leadcrow|Template:D2 Unique]] |9 |No |- |30 !align=left|[[D2 Unique Normal bow#Rogue's Bow|Template:D2 Unique]] |20 |No |- |33 !align=left|[[D2 Unique Elite bow#Widowmaker|Template:D2 Unique]] |65 !Yes |- |clvl !align=left|[[D2 Unique Exceptional bow#Witchwild String|Template:D2 Unique]] |39 |No |}

Axe

Template:D2 Skill bonus |- |20 |align=left|[[D2 Rune Word blade#Grief|Template:D2 Unique bold]] axe |59 !Yes |- |20 |align=left|[[D2 Rune Word blade#Doom|Template:D2 Unique bold]] axe |67 |No |- |35 !align=left|[[D2 Unique Exceptional axe#Butcher's Pupil|Template:D2 Unique]] |39 |No |- |0.5*clvl |align=left|[[D2 Rune Word blade#Death|Template:D2 Unique bold]] axe |55 !Yes |- |50 !align=left|[[D2 Unique Elite axe#Razor's Edge|Template:D2 Unique]] |67 |No |- |66 !align=left|[[D2 Unique Elite axe#Death Cleaver|Template:D2 Unique]] |70 !Yes |}

Club

Template:D2 Skill bonus |- |20 !align=left|[[D2 Unique Exceptional club#Fleshrender|Template:D2 Unique]] |38 |No |}

Dagger

Template:D2 Skill bonus |- |33 !align=left|[[D2 Unique Elite dagger#Fleshripper|Template:D2 Unique]] |68 |No |- |35 !align=left|[[D2 Unique Exceptional dagger#Heart Carver|Template:D2 Unique]] |36 |No |- |40 !align=left|[[D2 Unique Exceptional throwing weapon#Deathbit|Template:D2 Unique]] |44 |No |- |50 !align=left|[[D2 Unique Elite throwing weapon#Warhrike|Template:D2 Unique]] |75 !Yes |}

Hammer

Template:D2 Skill bonus |- |20 |align=left|[[D2 Rune Word blunt#Doom|Template:D2 Unique bold]] hammer |67 |No |}

Polearm

Template:D2 Skill bonus |- |20 |align=left|[[D2 Rune Word blade#Destruction|Template:D2 Unique bold]] polearm |65 !Yes |- |20 |align=left|[[D2 Rune Word blade#Doom|Template:D2 Unique bold]] polearm |67 |No |- |20 |align=left|[[D2 Rune Word blade#Pride|Template:D2 Unique bold]] polearm |67 !Yes |- |30 !align=left|[[D2 Unique Normal polearm|Template:D2 Unique]] |14 |No |- |33 !align=left|[[D2 Unique Elite polearm#The Reaper's Toll|Template:D2 Unique]] |75 !Yes |- |55 !align=left|[[D2 Unique Exceptional polearm#Pierre Tombale Couant|Template:D2 Unique]] |43 |No |- |100 !align=left|[[D2 Unique Normal polearm#The Grim Reaper|Template:D2 Unique]] |29 |No |}

Spear

Template:D2 Skill bonus |- |50 !align=left|[[D2 Unique Elite spear#Arioc's Needle|Template:D2 Unique]] |81 |No |}

Staff

Template:D2 Skill bonus |- |25 !align=left|[[D2 Arcanna's Tricks#Arcanna's Deathwand|Template:D2 Set]] |15 |No |}

Sword

Template:D2 Skill bonus |- |20 |align=left|[[D2 Rune Word blade#Grief|Template:D2 Unique bold]] sword |59 !Yes |- |20 |align=left|[[D2 Rune Word blade#Destruction|Template:D2 Unique bold]] sword |65 !Yes |- |0.5*clvl |align=left|[[D2 Rune Word blade#Death|Template:D2 Unique bold]] sword |55 !Yes |- |50 !align=left|[[D2 Cleglaw's Brace#Cleglaw's Tooth|Template:D2 Set]] |4 |No |- |50 !align=left|[[D2 Unique Exceptional sword#Coldsteel Eye|Template:D2 Unique]] |31 |No |- |1.5*clvl !align=left|[[D2 Unique Exceptional sword#Headstriker|Template:D2 Unique]] |39 |No |}

Throwing weapon

Template:D2 Skill bonus |- |40 !align=left|[[D2 Unique Exceptional throwing weapon#Deathbit|Template:D2 Unique]] |44 |No |- |50 !align=left|[[D2 Unique Elite throwing weapon#Warhrike|Template:D2 Unique]] |75 !Yes |}

Shield

Template:D2 Skill bonus |- |20 !align=left|[[D2 Unique Exceptional shield#Lance Guard|Template:D2 Unique]] |35 |No |}

Boots

Template:D2 Skill bonus |- |15 !align=left|[[D2 Unique Exceptional boots#Gore Rider|Template:D2 Unique]] |47 |No |}

References

Question about "Critical Strike" on Insight (Technical Discussion)