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Darkmoon Card: Wrath

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Inv misc ticket tarot wrath
  • Darkmoon Card: Wrath
  • Item Level 100Disenchants into:
    [Void Crystal]: 1-2
  • Binds when equipped
  • Unique
  • Trinket
  • Requires Level 70
  • Equip: Each time one of your direct damage attacks does not critically strike, you gain 17 critical strike rating for the next 10 sec. This effect is consumed when you deal a critical strike.
  • Sell Price: 10Gold

This is one of the four available Darkmoon Cards trinkets added with the Burning Crusade expansion.

Obtaining the Trinket Edit

Darkmoon Card: Wrath is obtained by gathering all eight of the Storms cards, creating the Storms Deck by right-clicking on any of the cards, and turning in the deck to the Darkmoon Faire. All the individual cards and the deck itself are BoE items. Cards 2 through 4 are world drops, 5 through 8 are world drops from elite mobs, and the Ace drops from end bosses in instances.

Effects on Critical Strike Chance (general) Edit

Using the following java program we're able to simulate what happens to our crit rating when we use this trinket:

       public static void main(String[] args) {
       double crit=0;
       double x=0;
       double sum=0;
       int i=0;
       Random generator = new Random();
       for (crit=10;crit<40;crit++){
           sum=0;
       for (i=1;i<1000000;i++){
           if (generator.nextInt(100)+1>crit+x) x+=0.72; else x=0;
           if (x>0.72*20) x=0.72*20;
           sum+=x;
       }
       System.out.println("<tr><th>"+crit+"<td align=\"center\">"+(crit+sum/i)+"</td><td align=\"center\">"+((double)sum/i)*23.6+"</td>");
       }
       }

This simulates the behavior of the trinket after 1.000.000 strikes. The output is the following:

Trinket behavior over 1.000.000 iterations
Base Crit %Average Crit % with trinketAverage Crit rating given by the trinket
10.013.7566993599999488.65810489599859
11.014.57998327999951784.4876054079886
12.015.40002575999903280.24060793597717
13.016.2330203199984976.29927955196442
14.017.06690479999751372.37895327994127
15.017.9187273599965668.88196569591881
16.018.7855863999954165.7398390398917
17.019.64999815999398462.53995657585808
18.020.5364390399926259.859961343825795
19.021.4105369599908656.88867225578434
20.022.30560055998912454.412173215743366
21.023.20545431998696352.0487219516923
22.024.1047651999846949.6724587196387
23.025.02118759998463647.700027359637424
24.025.92784031998488545.49703155164326
25.026.85519807998503343.78267468764679
26.027.77204023998533341.820149663653865
27.028.6978017599855940.06812153565995
28.029.63159847998594338.50572412766823
29.030.56435335998625336.91873929567558
30.031.5075813599866435.57892009568475
31.032.45016135998703534.22380809569411
32.033.387041839987632.734187423707354
33.034.3359520799880331.528469087717557
34.035.2820521599884330.25643097572705
35.036.2315275999890329.06405135974111
36.037.18011455998967627.850703615756263
37.038.13282279999021526.734618079769085
38.039.0936454399907725.810032383782215
39.040.0512007199913624.80833699179606

With those results you should able to determine, considering your base chance to crit, if this trinket is a good choice for your character.


Effects on Critical Strike Chance for Casters Edit

The crit benefits of this trinket are affected by the chance of the player to have a streak of non-crit hits. These streaks are less likely for players who already have a high crit chance. Also, the trinket itself, by increasing crit chance, progressively makes long non-crit streaks less likely.

Streaks of Non-Crits Edit

In this example, resists will not be counted. A player with a 25% crit rate will be assumed to have a 75% non-crit hit rate. The probability that a series of non-crits of a certain length (called a streak on this page) occurring can be calculated by multiplying the non-crit hit rate to the power of its streak length. To clarify; the streak is quantified by presuming event X+1 is a critical. In other words:

  • chance of streak = xy    (where x = non-crit chance and y = length of streak)
Streaks without Trinket
# of CastsCrit ChanceNon-Crit ChanceChance of Non-Crit Streak
10.25000.75000.7500
20.25000.75000.5625
30.25000.75000.4219
40.25000.75000.3164
50.25000.75000.2373
60.25000.75000.1780
70.25000.75000.1335
80.25000.75000.1001
90.25000.75000.0751
100.25000.75000.0563

So with a 25% crit rate, the probability of having a streak of 10 non-crits is 5.63%. Although each cast has a 75% of being non-crit, the percentages have a cumulative effect when looking specifically for a block (or streak) of 10 non-crits in a row.

However, with the trinket, x in the above formula changes with each new non-crit in the streak, because the buff increases the crit rate cummulatively as the streak continues. The modified version this:

Streaks with Trinket
# of CastsCrit ChanceNon-Crit ChanceChance of Non-Crit Streak
10.25000.75000.7500
20.25770.74230.5567
30.26540.73460.4090
40.27310.72690.2973
50.28080.71920.2138
60.28850.71150.1521
70.29620.70380.1071
80.30380.69620.0745
90.31150.68850.0513
100.31920.68080.0349

The new Chance of Non-Crit Streak is equal to new Non-Crit Chance times the previous Chance of Non-Crit Streak. The blue * yellow = green numbers demonstrate this formula.

  • 0.7269 * 0.4090 = 0.2973
  • 0.6808 * 0.0513 = 0.0349

As you can see, players with a 25% crit rate will have a crit rate of 32% if they have had 10 non-crits in a row, but the chance of having 10 non-crits in a row is only 3.5%. To get an idea of how effective the trinket is, the number of extra crits contributed by the trinket for each scenario must be calculated and then added together.

In the table above, we listed the chance of having a streak of at least X non-crits in a row. The table below breaks down the contribution of the trinket for each streak scenario. This contribution is calculated by multiplying the bonus critical of the trinket by the incidence of the streak. The incidence can be calculated from the above table by deducting the non-streak chance of X from the chance of X-1. For example, there is a 0.75 incidence of a non-critical, and the incidence of a second non-critical is 0.5567 (these values are fractions of the total number of casts done.) The fraction of streaks that end at 1 (i.e. the second cast is a crit) is 0.1933, since the remainder (0.5567) had a second non-crit event. The final column is the product of this number and the increase in crit caused by the trinket, which tells us the fraction of streaks that ended because of the trinket.

Impact of Wrath trinket on ending streaks
X = Streak LengthAdditional Crit from TrinketStreak IncidenceIncidence of crits due to trinket
00.00000.25000.0000
10.00770.19330.0015
20.01540.14770.0023
30.02310.11170.0026
40.03080.08350.0026
50.03850.06170.0024
60.04620.04510.0021
70.05380.03250.0017
80.06150.02320.0014
90.06920.01640.0011
100.07690.01140.0009
TOTALS:-0.97650.0185

For example, a streak of 5 non-crits followed by one crit has a fraction of 0.0617 of all streaks, and the increase in crit from the Wrath trinket is 3.85%. In other words, Wrath provided a 3.85% increased chance to crit for 6.17% of crit events. The table above shows the first 11 (and most likely) occurrences: that you have a streak of non-crits of length zero, a streak of length 1, a streak of length 2, etc. Adding their fractions together, these 11 possibilities summarises 97.65% of all cases (the remaining cases are streaks longer than 10). If we then add up the fractions of crits caused by the trinket, the wrath trinket increases the incidence of crits by 1.85% of all casts. The real figure is higher than this, but this is pretty close since streaks above 10 are unlikely, and its contribution soon becomes insignificant (if you go to 20, you cover 99.977% of the streaks and an increase of 2.0857%; at 29 it is 99.9998% of cases and an increase of 2.0892%).

The table above was calculated for someone who had a base crit rate of 25% (i.e. excluding contributions by the trinket.) If we convert the summed incidence of crits caused by the trinket and convert it to an equivalent critical strike rating, we get the approximate values below (to 20 iterations).

Equivalent Crit Ratings
Base Crit RateEquivalent Crit Rating
45%20
40%24
35%30
30%37
25%46
20%59
15%77
10%104
5%146

As your base crit rate increases, the value of this trinket decreases, but it is a very valuable trinket at lower rates. For those who are comparing various trinkets, this trinket has a critical rating of exactly 40 (the equivalent of [Battlemaster's Depravity], without the very useful temporary health bonus, or [Sextant of Unstable Currents] without the potential increase in spell damage) at a base critical rate of 28.13%. It also has a critical rating of exactly 32 (like the spell critical bonus of [Xi'ri's Gift], for example) at a base critical rate of 33.32%.

The sections below will be of interest to players concerned about long streaks of non-crits (perhaps warlocks trying to keep up Improved Shadowbolt procs).

Rating the effect of the trinket Edit

The significant effect of the trinket is in how it decreases the Chance of Non-Crit Streak. You can think of Chance of Non-Crit Streak as the opposite of crit chance over a given number of casts. For example, in the above chart, there is a 10.71% chance for a streak of 7 non-crits. That also means that there is a 89.29% chance that the streak will fail, that any one cast out of a block of 7 will crit. However, without the effect of the trinket, the streak chance is 13.35% for 7 casts. Without the trinket, there is an 86.65% chance the streak will fail.

So the trinket has increased the chance of at least one crit in any seven casts by 2.64%. Even though the 7 charges would add 5.38% crit chance to the next cast, the unlikelihood of getting 7 non-crits in a row balances that out. This includes the cumulative effect of the base crit rate and the trinket's increasing charges.

In other words, the effect of the trinket can be expressed in terms of the difference between the likelihood of non-crit streaks with and without the trinket. The following graph shows net crit chance increase caused by the trinket over a number of casts for players with different amounts of base crit.


 


Wrathcriteffects   So, as an example from the graph, a player with a base crit rate of 15% will be about 6% less likely to have a string of 14 non-crits due to the trinket. That is to say, he will be 6% more likely to have any one cast crit out of a block of 14. As you can see, the more base crit you have, the less benefit you get from the trinket, because the likelihood of long strings of non-crits is so low. Also, as you consider longer and longer streaks, the net benefit of the trinket actually begins to decrease. This is because the chance of one crit in say 18 or 20 casts is so high that any amount of crit increase is insignificant.

Summary Edit

Since Darkmoon Card: Wrath increases a player's crit rate only while the player is not critting, it is reducing its chance to build charges while building charges. So even though at 7 charges the trinket increases crit rate by 5.38%, we have to balance that with the increasing unlikelihood that the player will have 7 non-crits in a row, an unlikelihood affected by base crit plus added crit from the trinket.

Instead of looking flatly at crit increase, we can look at the difference in likelihood of non-crit streaks between streaks affected by the trinket and streaks with only base crit. The difference in these is the increased chance that any one cast across the streak will crit. Interestingly, we found that the benefit of the trinket maxes out at a certain point, and that longer streaks of non-crits are so unlikely that the trinket adds little to the cumulative effect of the base crit rate. Using this difference as a yardstick for the trinket's effect, here are some results for various base crit rates:

Net Benefit from Trinket for Different Base Crit Rates
Base CritAverage EffectMaximum Effect
10% 4.9% crit increase 54% of the time  12.7% crit increase 10.2% of the time 
15% 2.8% crit increase 49% of the time  6.7% crit increase 10% of the time 
20% 1.5% crit increase 50% of the time  4% crit increase 9.4% of the time 
25% 0.6% crit increase 56% of the time  2.6% crit increase 10.7% of the time 
30% 0.5% crit increase 49% of the time  1.8% crit increase 10% of the time 
  • Average Effect is the crit rate increase for streaks that have a ~50% chance of occurrence
  • Maximum Effect is the largest difference in likelihood of non-crit streaks caused by the trinket

Raw Data Edit

Net Crit Increase from Trinket
 Chance of Non-Crit Streak (10% base)Crit Chance Increase Chance of Non-Crit Streak (15% base)Crit Chance Increase Chance of Non-Crit Streak (20% base)Crit Chance Increase
# of castsw/o trinketwith trinket  w/o trinketwith trinket  w/o trinketwith trinket 
10.90000.90000.0000  0.85000.85000.0000  0.80000.80000.0000
20.81000.80310.0069  0.72250.71600.0065  0.64000.63380.0062
30.72900.71040.0186  0.61410.59760.0166  0.51200.49730.0147
40.65610.62300.0331  0.52200.49410.0279  0.40960.38640.0232
50.59050.54150.0490  0.44370.40480.0389  0.32770.29720.0305
60.53140.46650.0649  0.37710.32850.0486  0.26210.22630.0358
70.47830.39830.0799  0.32060.26410.0565  0.20970.17060.0391
80.43050.33710.0934  0.27250.21020.0622  0.16780.12730.0405
90.38740.28260.1048  0.23160.16580.0658  0.13420.09400.0402
100.34870.23480.1139  0.19690.12940.0674  0.10740.06870.0387
110.31380.19320.1206  0.16730.10010.0673  0.08590.04970.0362
120.28240.15760.1249  0.14220.07660.0657  0.06870.03550.0332
130.25420.12730.1269  0.12090.05800.0629  0.05500.02520.0298
140.22880.10180.1270  0.10280.04350.0592  0.04400.01760.0264
150.20590.08070.1252  0.08740.03230.0550  0.03520.01220.0230
160.18530.06330.1220  0.07430.02370.0505  0.02810.00830.0198
170.16680.04920.1176  0.06310.01730.0459  0.02250.00560.0169
180.15010.03780.1123  0.05360.01240.0412  0.01800.00380.0142
190.13510.02880.1063  0.04560.00880.0368  0.01440.00250.0119
200.12160.02170.0999  0.03880.00620.0325  0.01150.00160.0099


 


Net Crit Increase from Trinket (2)
 Chance of Non-Crit Streak (25% base)Crit Chance Increase Chance of Non-Crit Streak (30% base)Crit Chance Increase
# of castsw/o trinket;with trinket  w/o trinketwith trinket 
10.75000.75000.0000  0.70000.70000.0000
20.56250.55670.0058  0.49000.48460.0054
30.42190.40900.0129  0.34300.33180.0112
40.31640.29730.0191  0.24010.22460.0155
50.23730.21380.0235  0.16810.15030.0178
60.17800.15210.0258  0.11760.09940.0182
70.13350.10710.0264  0.08240.06500.0173
80.10010.07450.0256  0.05760.04200.0156
90.07510.05130.0238  0.04040.02680.0135
100.05630.03490.0214  0.02820.01690.0113
110.04220.02350.0187  0.01980.01050.0092
120.03170.01560.0160  0.01380.00650.0074
130.02380.01030.0135  0.00970.00390.0057
140.01780.00670.0111  0.00680.00240.0044
150.01340.00430.0091  0.00470.00140.0033
160.01000.00270.0073  0.00330.00080.0025
170.00750.00170.0058  0.00230.00050.0019
180.00560.00110.0046  0.00160.00030.0014
190.00420.00060.0036  0.00110.00020.0010
200.00320.00040.0028  0.00080.00010.0007

Simulation Edit

A simple script that runs simulations of stacking Wrath buffs for casters, and computes the effective crit increase, can be found here.


External linksEdit


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