Chance to Cast

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Skills % Chance to Cast Charges Oskills Aura When Equipped


% Chance to Cast gives a chance to use a skill when triggered by an event, without costing any mana.

  • Skill level cannot be increased: however, equipping multiple % Chance to Cast of the same skill, level and event will result in the individual percentages being added together to apply a single % Chance to Cast of that skill, level and event (although >100% Chance to Cast is redundant). [1]
  • Skills used receive passive bonuses including synergy bonuses, but do not apply them.
  • The existence of pets summoned will be unstable unless the player invests skill points in the native skill or acquires it from an Oskill. Pets will not be summoned by hirelings.
  • % Chance to Cast on Attack, on Striking and When You Kill an Enemy are restricted to the weapon on which they spawn (% Chance to Cast on one weapon will not apply to the other). [2]
  • No % Chance to Cast is applied while using Whirlwind.


  • Ladder Unique items can be found in Ladder and single-player games; Ladder Rune Words can only be made in Ladder games.


Skill level

% Chance to Cast normally specifies a set skill level (slvl), but a few apply a skill level which is dependent on the skill's required level (rlvl) and the item level (ilvl): slvl = min([(ilvl-rlvl)/4]+1,20). [3] The table below specifies the minimum ilvl required for particular slvls, dependent on the skill's rlvl.


Rlvl Slvl
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1 1 5 9 13 17 21 25 29 33 37 41 45 49 53 57 61 65 69 73 77
6 3 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82
12 9 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88
18 15 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94
24 21 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96
30 27 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94 98


This only applies to seven Unique items. In practice, minimum slvl is determined by the Unique item level or its base item level, whichever is highest. The table below specifies the minimum ilvl required for particular slvls.


Unique item Level Skill Rlvl Slvl Chance Event
7 8 9 10 11 12 13 14 15 16 17 18 19 20
Template:D2 Unique 73 Chain Lightning 18 70 74 78 82 86 90 94 5 On Attack
Template:D2 Unique 73 Fire Ball 12 72 76 80 84 88 10 On Attack
Template:D2 Unique 49 Charged Bolt 1 49 53 57 61 65 69 73 77 10 On Striking
Template:D2 Unique 73 Meteor 24 72 76 80 84 88 92 96 2 When Struck
Template:D2 Unique 49 Blizzard 24 48 52 56 60 64 68 72 76 80 84 88 92 96 5 When Struck
Template:D2 Unique 50 Holy Bolt 6 50 54 58 62 66 70 74 78 82 50 When Struck
Template:D2 Unique 85 Charged Bolt 1 77 2 When Struck


On Attack

% Chance to Cast on Attack is applied whenever using a melee attack even when that attack misses or gets blocked, or if Dodge, Evade or Weapon Block are applied.

  • Not applied when using a ranged attack or missile weapon (Amazon bow, bow or crossbow), except when a Werewolf or Werebear is using a missile weapon with a melee attack.
  • Applied by Blade Shield (although it is applied as on Striking).
  • Charged Bolt and Frozen Orb are cast at the target from the user's location; all other skills below are cast at or from the target's location.


Class Skill Level Chance Item Ladder
Sorceress Charged Bolt 20 20 Template:D2 Unique sword/hammer/axe Yes
Fire Ball 6 10 Template:D2 Unique No
16-20 10 Template:D2 Unique No
Nova 22 15 Template:D2 Unique polearm/sword Yes
Chain Lightning 14-20 5 Template:D2 Unique No
Glacial Spike 18 25 Template:D2 Unique sword/axe Yes
Frozen Orb 21 16 Template:D2 Unique polearm/scepter Yes


Item suffixes


Class Skill Level Chance Item Alvl Rlvl
Sorceress Fire Bolt 3 5
  • Weapon 1
 6 4
4 10 20 15
Ice Bolt 3 5
  • Weapon 1
 6 4
Lightning 3 5
  • Weapon 1
 18 13
Chain Lightning 3 5
  • Amulet
  • Weapon 1
  • Ring
 25 18
3 8 35 26
5 8 45 33


1 Excluding missile weapons

On Striking


When Struck


When You Die


Class Skill Level Chance Item Ladder
Necromancer Poison Nova 51 100 Template:D2 Unique No
Sorceress Nova 44 100 Template:D2 Unique No
Chain Lightning 44 100 Template:D2 Unique sword/axe Yes
47 100 Template:D2 Unique No
Meteor 31 100 Template:D2 Unique No
45 100 Template:D2 Unique polearm/sword Yes
48 100 Template:D2 Unique weapon No
Blizzard 37 100 Template:D2 Unique No


When You Kill an Enemy

% Chance to Cast When You Kill an Enemy is applied when a target is killed by the user's weapon damage, poison damage applied by either weapon or skill, or Open Wounds.


Class Skill Level Chance Item Ladder
Necromancer Decrepify 6 50 Template:D2 Unique Yes
Poison Nova 20 50 Template:D2 Unique weapon No
Sorceress Enchant 21 30 Template:D2 Unique polearm Yes
Chain Lightning 20 50 Template:D2 Unique polearm Yes


When You Level-up

  • All skills below are cast on the user, or on or from their location.


Class Skill Level Chance Item Ladder
Assassin Venom 23 100 Template:D2 Unique No
Sorceress Frost Nova 43 100 Template:D2 Unique No
Blaze 29 100 Template:D2 Unique No
36 100 Template:D2 Unique weapon No
40 100 Template:D2 Unique weapon/shield Yes
Nova 41 100 Template:D2 Unique No
Blizzard 40 100 Template:D2 Unique missile weapon Yes


Casting order

Casting order is normally irrelevant: if two or more skills are triggered by the same event, all are cast, even if there are two or more delays: those for each skill are not applied. [4] [5] However, an 11 frame delay is applied from the action flag (the frame in the attack or casting animation in which the action is actually executed). During this delay no active skills can be used, although Scrolls of Identify and Town Portal placed in the belt can be used. [6] [7]


This 11 frame delay does not interrupt an attack sequence if % Chance to Cast is applied during that sequence. The delay can be applied from the action flag of any individual attack in the sequence, so if it is applied by an attack early in the sequence then the delay may end before that sequence ends. If multiple attacks in a sequence apply % Chance to Cast, the delay is applied from the last attack in the sequence to apply it. [8]


Casting order only becomes relevant when two or more skills using next delay missiles are cast (since the next delay of the first cast may prevent those following from applying to the target), or when two or more Curses are cast (since the last cast will normally overwrite those preceding it). The factors affecting casting order for all remaining cases take precedence in the following order:

Trigger event

Event Curses [9] Other [10]
Active
  1. On Striking
  2. On Attack
  3. When You Kill An Enemy
  4. When You Level-up
  1. On Attack
  2. On Striking
  3. When You Kill An Enemy
  4. When You Level-up
Passive
  1. When Struck
  2. When You Die
  1. When Struck
  2. When You Die


Equipping order

When the trigger event is the same, equipping order determines casting order: first equipped, first cast and so on. [11] [12] Only when the user switches weapons, levels-up or dies will the game re-equip weapons or items in the following order: [13]


  1. Head
  2. Neck
  3. Torso
  4. Right Arm
  5. Left Arm
  6. Right Ring
  7. Left Ring
  8. Belt
  9. Feet
  10. Gloves


Skill/stat order

When the trigger event and item are the same, casting order is determined by the displayed order: Curses are cast in descending order (first displayed to last), [14] while other skills are cast in ascending order (last displayed to first). [15] The table lists Curses and skills in casting order, not displayed order:


Curse Skill
  1. Taunt
  2. Howl 1
  3. Lower Resist
  4. Decrepify
  5. Attract
  6. Life Tap
  7. Confuse
  8. Terror
  9. Iron Maiden
  10. Weaken
  11. Dim Vision
  12. Amplify Damage
  13. Hit Blinds Target
  14. Hit Causes Monster to Flee
  1. Frost Nova
  2. Nova
  3. Chain Lightning
  4. Teeth
  5. Poison Nova
  6. Twister 2
  7. Volcano 2
  8. Tornado 2


1 Howl may be cast second, but due to its mechanics it is actually applied last. [16]
2 Twister, Volcano and Tornado mechanics will often result in variations between casting and application order.

Skill Level

When the trigger event, item and skill are the same, casting order is determined by ascending order of skill level: the lowest is cast first and the highest is cast last. [17]


References

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