All mechanics

Mechanics · Skills

Chance to Cast

In the game: X% Chance to cast level X … on attackCtCSame against players

How it works

The item has a chance to cast a skill for free when something happens. The skill and its level are fixed on the item, and it costs no mana. Each trigger is a separate stat:

Trigger	When it rolls
on attack	every attack, hit or miss
on striking	an attack that hits
when struck	a monster hits you
on kill	you kill a monster
on death	you die
on level-up	you gain a level

The skill can belong to another class, like Windhammer's Twister or Bonehew's Bone Spear.

+skills from your gear do not raise the level of a chance-to-cast skill.

See also Charged Skills and Aura When Equipped.

Where it comes from

169 sources · every item, runeword, rune and affix that gives it

SlotAllWeapon (47)Helm (4)Body Armor (7)Shield (11)Gloves (6)Boots (1)Belt (2)Amulet (4)Ring (3)Charm (1)Jewel (14)Set bonus (2)Runeword (48)Affix (19)My levelMy classAnyAmazonAssassinBarbarianDruidNecromancerPaladinSorceressWarlockAt leastSortBy slotStrongest firstLowest level firstName

AllUniques 89Set items 13Runewords 48Affixes 19

169 sources

Source	Gives	Lvl
Weapon 47
WindhammerUnique · Ogre Maul	33% Chance to cast level 22 Twister on striking	68
StormlashUnique · Scourge	15% Chance to cast level 10 Static Field on striking · 20% Chance to cast level 18 Tornado on striking	82
BonehewUnique · Ogre Axe	50% Chance to cast level 16 Bone Spear on striking	64
FlamebellowUnique · Balrog Blade	12% Chance to cast level 16 Firestorm on striking	71
Horizon's TornadoUnique · Scourge	20% Chance to cast level 15 Tornado on striking	64
Earth ShifterUnique · Thunder Maul	25% Chance to cast level 14 Fissure on striking	69
ThunderstrokeUnique · Matriarchal Javelin	20% Chance to cast level 14 Lightning on strikingAmazon only	69
Arm of King LeoricUnique · Tomb Wand	5% Chance to cast level 10 Bone Spirit when struck · 10% Chance to cast level 2 Bone Prison when struck	36
ColdkillUnique · Hatchet	10% Chance to cast level 10 Ice Blast on striking · 10% Chance to cast level 5 Frost Nova when struck	36
StormriderUnique · Tabar	5% Chance to cast level 10 Chain Lightning on striking · 10% Chance to cast Charged Bolt on striking (level set by item level) · 15% Chance to cast level 5 Charged Bolt when struck	41
Schaefer's HammerUnique · Legendary Mallet	20% Chance to cast level 10 Static Field on striking	79
ViperforkUnique · Mancatcher	15% Chance to cast level 9 Poison Explosion on striking	71
WarshrikeUnique · Winged Knife	25% Chance to cast level 9 Nova on striking	75
Baezil's VortexUnique · Knout	5% Chance to cast level 8 Nova on striking	45
Pompeii's WrathUnique · Crowbill	4% Chance to cast level 8 Volcano on striking	45
Guardian NagaUnique · Naga	5% Chance to cast level 8 Poison Nova on striking	48
Shadow KillerUnique · Battle Cestus	33% Chance to cast level 8 Frost Nova on strikingAssassin only	78
EarthshakerUnique · Battle Hammer	5% Chance to cast level 7 Fissure on striking	43
CloudcrackUnique · Gothic Sword	6% Chance to cast level 7 Fist of the Heavens on striking	45
Goldstrike ArchUnique · Gothic Bow	5% Chance to cast level 7 Fist of the Heavens on striking	46
SkystrikeUnique · Edge Bow	2% Chance to cast level 6 Meteor on striking	28
Pus SpitterUnique · Siege Crossbow	4% Chance to cast level 1 Lower Resist on striking · 9% Chance to cast level 6 Poison Nova when struck	36
MoonfallUnique · Jagged Star	5% Chance to cast level 6 Meteor on striking	42
Todesfaelle FlammeUnique · Zweihander	10% Chance to cast level 6 Fire Ball on attack	46
Executioner's JusticeUnique · Glorious Axe	50% Chance to cast level 6 Decrepify when you Kill an Enemy	75
Zakarum's HandUnique · Rune Scepter	6% Chance to cast level 5 Blizzard on striking	37
Witchwild StringUnique · Short Siege Bow	2% Chance to cast level 5 Amplify Damage on striking	39
Blackleach BladeUnique · Bill	5% Chance to cast level 5 Weaken on striking	42
StormspireUnique · Giant Thresher	5% Chance to cast level 5 Chain Lightning when struck · 2% Chance to cast Charged Bolt when struck (level set by item level)	70
Plague BearerUnique · Rune Sword	5% Chance to cast level 4 Poison Nova on striking	41
Hand of Blessed LightUnique · Divine Scepter	5% Chance to cast level 4 Fist of the Heavens on striking	42
Hwanin's JusticeSet item · Bill	10% Chance to cast level 3 Ice Blast on striking	28
StormspikeUnique · Stiletto	25% Chance to cast level 3 Charged Bolt when struck	41
Bing Sz WangUnique · Dacian Falx	5% Chance to cast level 3 Frozen Orb on striking	43
DreadfangUnique · Legend Sword	33% Chance to cast level 3 Amplify Damage on strikingRotW	61
Dangoon's TeachingSet item · Reinforced Mace	10% Chance to cast level 3 Frost Nova on striking	68
LaceratorUnique · Winged Axe	33% Chance to cast level 3 Amplify Damage on striking	68
DoombringerUnique · Champion Sword	8% Chance to cast level 3 Weaken on striking	69
The Fetid SprinklerUnique · Holy Water Sprinkler	5% Chance to cast level 1 Decrepify on striking · 10% Chance to cast level 1 Confuse on striking	38
The OculusUnique · Swirling Crystal	25% Chance to cast level 1 Teleport when struckSorceress only	42
The Vile HuskUnique · Tusk Sword	6% Chance to cast level 1 Amplify Damage on striking	44
The Gavel of PainUnique · Martel de Fer	5% Chance to cast level 1 Amplify Damage on striking · 5% Chance to cast level 1 Iron Maiden when struck	45
The Reaper's TollUnique · Thresher	33% Chance to cast level 1 Decrepify on striking	75
The Cranium BasherUnique · Thunder Maul	4% Chance to cast level 1 Amplify Damage on striking	87
Boneslayer BladeUnique · Gothic Axe	50% Chance to cast Holy Bolt when struck (level set by item level)	42
LightsabreUnique · Phase Blade	5% Chance to cast Chain Lightning on attack (level set by item level)	58
HellslayerUnique · Decapitator	10% Chance to cast Fire Ball on attack (level set by item level)	66
Helm 4
Andariel's VisageUnique · Demonhead	15% Chance to cast level 15 Poison Nova when struck	83
Naj's CircletSet item · Circlet	12% Chance to cast level 5 Chain Lightning when struck	28
Darksight HelmUnique · Basinet	6% Chance to cast level 3 Dim Vision when struck	38
Ondal's AlmightySet item · Spired Helm	10% Chance to cast level 3 Weaken on striking	69
Body Armor 7
Steel CarapaceUnique · Shadow Plate	8% Chance to cast level 6 Iron Maiden when struck	66
Cow King's HideSet item · Studded Leather	18% Chance to cast level 5 Chain Lightning when struck	18
Immortal King's Soul CageSet item · Sacred Armor	5% Chance to cast level 5 Enchant when struckD2R	76
Hwanin's RefugeSet item · Tigulated Mail	10% Chance to cast level 3 Static Field when struck	30
Dark AdherentSet item · Dusk Shroud	25% Chance to cast level 3 Nova when struck	43
M'avina's EmbraceSet item · Kraken Shell	10% Chance to cast level 3 Glacial Spike when struck	70
CorpsemournUnique · Ornate Plate	6% Chance to cast level 2 Iron Maiden when struck	55
Shield 11
Medusa's GazeUnique · Aegis	10% Chance to cast level 7 Lower Resist when struck · 100% Chance to cast level 44 Nova when you Die	76
Ars Dul'MephistosUnique · Occult Tome	15% Chance to cast level 28 Blizzard when struckRotWWarlock only	78
Measured WrathUnique · Burnt Text	5% Chance to cast level 25 Ring of Fire when struckRotWWarlock only	52
Tiamat's RebukeUnique · Dragon Shield	5% Chance to cast level 9 Frost Nova when struck · 5% Chance to cast level 7 Nova when struck · 3% Chance to cast level 6 Hydra when struck	38
Spirit WardUnique · Ward	5% Chance to cast level 8 Fade when struck	68
StormchaserUnique · Scutum	4% Chance to cast level 6 Blizzard when struck · 4% Chance to cast level 5 Tornado when struck	35
Radament's SphereUnique · Ancient Shield	5% Chance to cast level 5 Poison Nova when struck	50
Blackoak ShieldUnique · Luna	4% Chance to cast level 5 Weaken when struck	61
BoneflameUnique · Succubus Skull	15% Chance to cast level 3 Terror when struckNecromancer only	72
Ars Tor'BaalosUnique · Blasphemous Compendium	15% Chance to cast level 1 Decrepify when struckRotWWarlock only	73
Ars Al'DiabolosUnique · Blasphemous Grimoire	15% Chance to cast level 1 Terror when struckRotWWarlock only	80
Gloves 6
HellmouthUnique · War Gauntlets	2% Chance to cast level 4 Meteor on striking · 4% Chance to cast level 12 Firestorm on striking	47
Lava GoutUnique · Battle Gauntlets	2% Chance to cast level 10 Enchant on striking	42
Dracul's GraspUnique · Vampirebone Gloves	5% Chance to cast level 10 Life Tap on striking	76
Immortal King's ForgeSet item · War Gauntlets	12% Chance to cast level 4 Charged Bolt when struck	30
Laying of HandsSet item · Bramble Mitts	10% Chance to cast level 3 Holy Bolt on striking	63
Soul DrainerUnique · Vambraces	8% Chance to cast level 3 Weaken on striking	74
Boots 1
InfernostrideUnique · Demonhide Boots	5% Chance to cast level 8 Blaze when struck	29
Belt 2
Thundergod's VigorUnique · War Belt	5% Chance to cast level 7 Fist of the Heavens when struck	47
SnowclashUnique · Battle Belt	5% Chance to cast Blizzard when struck (level set by item level)	42
Amulet 4
Entropy LocketUnique · Amulet	4% Chance to cast level 19 Miasma Chain on strikingRotW	54
Saracen's ChanceUnique · Amulet	10% Chance to cast level 2 Iron Maiden when struck	47
Atma's ScarabUnique · Amulet	5% Chance to cast level 2 Amplify Damage on striking	60
The Rising SunUnique · Amulet	2% Chance to cast Meteor when struck (level set by item level)	65
Ring 3
Wisp ProjectorUnique · Ring	10% Chance to cast level 16 Lightning on striking	76
OpalveinUnique · Ring	2% Chance to cast level 15 Flame Wave on attackRotW	50
Carrion WindUnique · Ring	10% Chance to cast level 10 Poison Nova when struck · 8% Chance to cast level 13 Twister on striking	60
Charm 1
Hellfire TorchUnique · Large Charm	5% Chance to cast level 10 Firestorm on striking	75
Jewel 14
Rainbow FacetUnique · Jewel	100% Chance to cast level 51 Poison Nova when you Die	49
Rainbow FacetUnique · Jewel	100% Chance to cast level 47 Chain Lightning when you Die	49
Rainbow FacetUnique · Jewel	100% Chance to cast level 43 Frost Nova when you Level-Up	49
Rainbow FacetUnique · Jewel	100% Chance to cast level 41 Nova when you Level-Up	49
Rainbow FacetUnique · Jewel	100% Chance to cast level 37 Blizzard when you Die	49
Rainbow FacetUnique · Jewel	100% Chance to cast level 31 Meteor when you Die	49
Rainbow FacetUnique · Jewel	100% Chance to cast level 29 Blaze when you Level-Up	49
Defender's BileUnique · Colossal Jewel	1% Chance to cast level 25 Bone Armor when struckRotW	75
Defender's FireUnique · Colossal Jewel	1% Chance to cast level 25 Blaze when struckRotW	75
Guardian's LightUnique · Colossal Jewel	1% Chance to cast level 25 Psychic Ward when struckRotW	75
Guardian's ThunderUnique · Colossal Jewel	1% Chance to cast level 25 Cyclone Armor when struckRotW	75
Protector's FrostUnique · Colossal Jewel	1% Chance to cast level 25 Frozen Armor when struckRotW	75
Rainbow FacetUnique · Jewel	100% Chance to cast level 23 Venom when you Level-Up	49
Protector's StoneUnique · Colossal Jewel	1% Chance to cast level 15 Fade when struckRotW	75
Set bonus 2
M'avina's CasterSet bonus · Grand Matron Bow	10% Chance to cast level 15 Nova on strikingAmazon only3 pieces worn	70
Cow King's LeathersFull set	25% Chance to cast level 5 Static Field when struckFull set	25
Runeword 48
ZephyrRuneword	7% Chance to cast level 1 Twister when struckWeapon	21
MythRuneword	10% Chance to cast level 1 Taunt on striking · 3% Chance to cast level 1 Howl when struckBody Armor	25
AuthorityRuneword	2% Chance to cast level 10 Psychic Ward when struck · 10% Chance to cast level 15 Miasma Chain on strikingRotWBody Armor	29
PeaceRuneword	2% Chance to cast level 15 Valkyrie on striking · 4% Chance to cast level 5 Slow Missiles when struckBody Armor	29
HustleRuneword	5% Chance to cast level 1 Burst of Speed on strikingD2RLadder S3–14Weapon	39
ObedienceRuneword	30% Chance to cast level 21 Enchant when you Kill an EnemyWeapon	41
Unbending WillRuneword	18% Chance to cast level 18 Taunt on strikingD2RLadder S1–2Weapon	41
LawbringerRuneword	20% Chance to cast level 15 Decrepify on strikingWeapon	43
TreacheryRuneword	25% Chance to cast level 15 Venom on striking · 5% Chance to cast level 15 Fade when struckBody Armor	43
Voice of ReasonRuneword	18% Chance to cast level 20 Ice Blast on striking · 15% Chance to cast level 13 Frozen Orb on strikingWeapon	43
EnlightenmentRuneword	5% Chance to cast level 15 Fire Ball on striking · 5% Chance to cast level 15 Blaze when struckBody Armor	45
BoneRuneword	15% Chance to cast level 10 Bone Spear on striking · 15% Chance to cast level 10 Bone Armor when struckBody Armor	47
Crescent MoonRuneword	7% Chance to cast level 13 Static Field on striking · 10% Chance to cast level 17 Chain Lightning on strikingWeapon	47
GloomRuneword	15% Chance to cast level 3 Dim Vision when struckBody Armor	47
OathRuneword	30% Chance to cast level 20 Bone Spirit on strikingWeapon	49
RainRuneword	5% Chance to cast level 15 Twister on striking · 5% Chance to cast level 15 Cyclone Armor when struckBody Armor	49
CovenRuneword	5% Chance to cast level 10 Sigil: Lethargy when struckRotWBody Armor	51
DeliriumRuneword	11% Chance to cast level 18 Confuse on striking · 14% Chance to cast level 13 Terror when struck · 6% Chance to cast level 14 Mind Blast when struck · 1% Chance to cast level 50 Delirium when struckBody Armor	51
PrincipleRuneword	100% Chance to cast level 5 Holy Bolt on strikingBody Armor	53
RiftRuneword	20% Chance to cast level 16 Tornado on striking · 16% Chance to cast level 21 Frozen Orb on attackWeapon	53
VigilanceRuneword	5% Chance to cast level 10 Ring of Fire when struckRotWShield	53
DeathRuneword	25% Chance to cast level 18 Glacial Spike on attack · 100% Chance to cast level 44 Chain Lightning when you DieWeapon	55
ChaosRuneword	9% Chance to cast level 11 Frozen Orb on striking · 11% Chance to cast level 9 Charged Bolt on strikingWeapon	57
ExileRuneword	15% Chance to cast level 5 Life Tap on strikingShield	57
RitualRuneword	13% Chance to cast level 1 Sigil: Death when struckRotWWeapon	57
FortitudeRuneword	20% Chance to cast level 15 Chilling Armor when struckWeapon	59
FortitudeRuneword	20% Chance to cast level 15 Chilling Armor when struckBody Armor	59
GriefRuneword	35% Chance to cast level 15 Venom on strikingWeapon	59
DragonRuneword	12% Chance to cast level 15 Hydra on striking · 20% Chance to cast level 18 Venom when struckBody Armor	61
DragonRuneword	12% Chance to cast level 15 Hydra on striking · 20% Chance to cast level 18 Venom when struckShield	61
WindRuneword	10% Chance to cast level 9 Tornado on strikingWeapon	61
InfinityRuneword	50% Chance to cast level 20 Chain Lightning when you Kill an EnemyWeapon	63
WrathRuneword	5% Chance to cast level 10 Life Tap on striking · 30% Chance to cast level 1 Decrepify on strikingWeapon	63
BrandRuneword	100% Chance to cast level 18 Bone Spear on striking · 35% Chance to cast level 14 Amplify Damage when struckWeapon	65
DestructionRuneword	5% Chance to cast level 23 Molten Boulder on striking · 100% Chance to cast level 45 Meteor when you Die · 15% Chance to cast level 22 Nova on attack · 23% Chance to cast level 12 Volcano on strikingWeapon	65
DreamRuneword	10% Chance to cast level 15 Confuse when struckBody Armor	65
DreamRuneword	10% Chance to cast level 15 Confuse when struckShield	65
IceRuneword	25% Chance to cast level 22 Frost Nova on striking · 100% Chance to cast level 40 Blizzard when you Level-UpWeapon	65
Last WishRuneword	20% Chance to cast level 20 Charged Bolt on attack · 10% Chance to cast level 18 Life Tap on striking · 6% Chance to cast level 11 Fade when struckWeapon	65
PhoenixRuneword	40% Chance to cast level 22 Firestorm on striking · 100% Chance to cast level 40 Blaze when you Level-UpWeapon	65
PhoenixRuneword	40% Chance to cast level 22 Firestorm on striking · 100% Chance to cast level 40 Blaze when you Level-UpShield	65
DoomRuneword	5% Chance to cast level 18 Volcano on strikingWeapon	67
Hand of JusticeRuneword	100% Chance to cast level 36 Blaze when you Level-Up · 100% Chance to cast level 48 Meteor when you DieWeapon	67
MetamorphosisRuneword	100% Chance to cast level 1 Mark of the Bear on striking · 100% Chance to cast level 1 Mark of the Wolf on strikingD2RLadder S3–14Body Armor	67
PlagueRuneword	20% Chance to cast level 12 Lower Resist when struck · 25% Chance to cast level 15 Poison Nova on strikingD2RLadder S1–2Weapon	67
PrideRuneword	25% Chance to cast level 17 Fire Wall when struckWeapon	67
Breath of the DyingRuneword	50% Chance to cast level 20 Poison Nova when you Kill an EnemyWeapon	69
ObsessionRuneword	24% Chance to cast level 10 Weaken when struckD2RLadder S1–2Weapon	69
Affix 19
Sof FireboltsSuffix	10% Chance to cast level 8 Fire Bolt on strikingrare onlyWeapon	16
Sof Charged BoltSuffix	14% Chance to cast level 5 Charged Bolt when struckrare onlyAny Armor, Ring, Amulet	26
Sof Nova ShieldSuffix	14% Chance to cast level 5 Nova when struckrare onlyAny Armor, Ring	38
Sof Chain LightningSuffix	8% Chance to cast level 5 Chain Lightning on attackrare onlyWeapon, Ring, Amulet	45
Sof Charged BoltSuffix	12% Chance to cast level 4 Charged Bolt when struckrare onlyAny Armor, Ring, Amulet	16
Sof FireboltsSuffix	10% Chance to cast level 4 Fire Bolt on attackrare onlyWeapon	20
Sof NovaSuffix	12% Chance to cast level 4 Nova on strikingrare onlyWeapon	28
Sof Nova ShieldSuffix	12% Chance to cast level 4 Nova when struckrare onlyAny Armor, Ring	28
Sof Charged BoltSuffix	10% Chance to cast level 3 Charged Bolt when struckrare onlyAny Armor, Ring, Amulet	6
Sof FireboltsSuffix	5% Chance to cast level 3 Fire Bolt on attackrare onlyWeapon	6
Sof IceboltSuffix	5% Chance to cast level 3 Ice Bolt on attackrare onlyWeapon	6
Sof Frost ShieldSuffix	5% Chance to cast level 3 Frost Nova when struckrare onlyAny Armor, Amulet	12
Sof LightningSuffix	5% Chance to cast level 3 Lightning on attackrare onlyWeapon	18
Sof NovaSuffix	10% Chance to cast level 3 Nova on strikingrare onlyWeapon	18
Sof Nova ShieldSuffix	10% Chance to cast level 3 Nova when struckrare onlyAny Armor, Ring	18
Sof Chain LightningSuffix	5% Chance to cast level 3 Chain Lightning on attackrare onlyWeapon, Ring, Amulet	25
Sof Chain LightningSuffix	8% Chance to cast level 3 Chain Lightning on attackrare onlyWeapon, Ring, Amulet	35
Sof Hydra ShieldSuffix	10% Chance to cast level 3 Hydra when struckrare onlyAmulet	40
Sof Amplify DamageSuffix	5% Chance to cast level 1 Amplify Damage on strikingrare onlyWeapon	3

Source: itemstatcost.txt (item_skillonattack, item_skillonhit, item_skillongethit, item_skillonkill, item_skillondeath, item_skillonlevelup) and properties.txt over the property codes of the game's item tables, the runeword lines and skills.txt (build 3.3.93847). Magic affixes are the ones that can spawn; a runeword's line includes what its runes add in that slot. “LoD 1.14d” is the value in classic Diablo II's last patch where it differs (uniques, set items, runewords' own bonuses, runes and gems; from blizzhackers/d2data); a D2R chip marks what 1.14d did not have. “Strongest” ranks items by the top of their roll range. · Report incorrect data