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Armor penetration (sometimes abbreviated ArP or called armor pen) is a number typically appearing on items that indicates the amount of armor ignored by an attack. It is a modifier that directly decreases the value of the armor of your target in combat time. Unlike Sunder Armor and Expose Armor which require active application, ArP items are passive.

Some abilities, enchantments, items, and spells can contribute by adding armor penetration. ArP can be found as both abilities (ex. Sunder Armor), or as passive statistical upgrades found on equipment pieces (ex. Season 3 PvP armor). Armor penetration reduces the amount of armor that your target has against melee attacks.

ArP is unique in that the more ArP you have, the greater the increase in damage becomes.

Armor penetration is sometimes confused with spell penetration, even though they are calculated and function differently.

Armor penetration is not a very recent stat. It has been seen in Serrated Blades since patch 1.10. Since itemization introduction of Arena Set 3, Blizzard has been popularizing the use of this modifier even into Wrath-Logo-Small.

Armor penetration rating Edit

Starting in patch 3.0, in preparation for the expansion Wrath-Logo-Small, all items with armor penetration have been modified to a rating system that affects a percentage of armor ignored. This means that gear scales more cleanly with all bosses but has a side effect of becoming less useful on low armor ones.

The conversion rate is about 7 ArP = 1 ArP rating. So if you had 1000 ArP, you now have 142.8 ArP rating. In the past, this would have been a 6% gain on a 15k armor foe and a 12.5% gain on an 8k armor foe; at level 80 it now gives a 9.2% gain to both targets.

ArP Rating required to ignore 1% armor
Level 60 Level 70 Level 80
3.75 5.92 12.31

Armor penetration rating against WOTLK Raid bosses Edit

The following tables provide detailed numbers for the effects of differeng levels of Armor Penetration Rating (ArP) in the case where a level 80 physical damage class attacks a level 83 raid boss with a given level of armor. ArP experiences diminishing returns for target armor levels greater than 8,317.

ARMOR REDUCTION TABLE
Level 80 Level 83 Target Armor
ArP %AR 1000 2000 3000 4000 5000 6000 7000 8000 8317 9000 10000 20000 30000 40000 50000
0 0.0% 1000 2000 3000 4000 5000 6000 7000 8000 8317 9000 10000 20000 30000 40000 50000
10 0.8% 992 1984 2976 3968 4959 5951 6943 7935 8249 8931 9928 19901 29874 39847 49820
20 1.6% 984 1968 2951 3935 4919 5903 6886 7870 8182 8861 9856 19802 29747 39693 49639
30 2.4% 976 1951 2927 3903 4878 5854 6829 7805 8114 8792 9784 19702 29621 39540 49459
40 3.2% 968 1935 2903 3870 4838 5805 6773 7740 8047 8722 9712 19603 29495 39387 49278
50 4.1% 959 1919 2878 3838 4797 5756 6716 7675 7979 8653 9639 19504 29369 39233 49098
60 4.9% 951 1903 2854 3805 4756 5708 6659 7610 7912 8584 9567 19405 29242 39080 48917
70 5.7% 943 1886 2829 3773 4716 5659 6602 7545 7844 8514 9495 19306 29116 38926 48737
80 6.5% 935 1870 2805 3740 4675 5610 6545 7480 7776 8445 9423 19206 28990 38773 48557
90 7.3% 927 1854 2781 3708 4634 5561 6488 7415 7709 8375 9351 19107 28863 38620 48376
100 8.1% 919 1838 2756 3675 4594 5513 6431 7350 7641 8306 9279 19008 28737 38466 48196
200 16.2% 838 1675 2513 3350 4188 5025 5863 6700 6966 7612 8558 18016 27474 36933 46391
300 24.4% 756 1513 2269 3025 3781 4538 5294 6050 6290 6918 7836 17024 26212 35399 44587
400 32.5% 675 1350 2025 2700 3375 4050 4725 5400 5614 6223 7115 16032 24949 33866 42783
500 40.6% 594 1188 1781 2375 2969 3563 4157 4751 4939 5529 6394 15040 23686 32332 40978
600 48.7% 513 1025 1538 2050 2563 3076 3588 4101 4263 4835 5673 14048 22423 30799 39174
700 56.9% 431 863 1294 1725 2157 2588 3019 3451 3588 4141 4951 13056 21160 29265 37369
800 65.0% 350 700 1050 1400 1751 2101 2451 2801 2912 3447 4230 12064 19898 27731 35565
900 73.1% 269 538 807 1076 1344 1613 1882 2151 2236 2753 3509 11072 18635 26198 33761
1000 81.2% 188 375 563 751 938 1126 1314 1501 1561 2058 2788 10080 17372 24664 31956
1230 99.9% 1 2 2 3 4 5 6 6 7 462 1129 7798 14468 21137 27806
Total effective target armor after ArP is applied
DAMAGE REDUCTION TABLE
Level 80 Level 83 Target Armor
ArP %AR 1000 2000 3000 4000 5000 6000 7000 8000 8317 9000 10000 20000 30000 40000 50000
0 0.0% 6.2% 11.6% 16.5% 20.8% 24.7% 28.3% 31.5% 34.4% 35.3% 37.1% 39.6% 56.8% 66.3% 72.4% 76.6%
10 0.8% 6.1% 11.5% 16.3% 20.7% 24.6% 28.1% 31.3% 34.3% 35.1% 37.0% 39.5% 56.6% 66.2% 72.3% 76.6%
20 1.6% 6.1% 11.4% 16.2% 20.5% 24.4% 27.9% 31.1% 34.1% 34.9% 36.8% 39.3% 56.5% 66.1% 72.3% 76.5%
30 2.4% 6.0% 11.4% 16.1% 20.4% 24.3% 27.8% 31.0% 33.9% 34.8% 36.6% 39.1% 56.4% 66.0% 72.2% 76.5%
40 3.2% 6.0% 11.3% 16.0% 20.3% 24.1% 27.6% 30.8% 33.7% 34.6% 36.4% 38.9% 56.3% 65.9% 72.1% 76.4%
50 4.1% 5.9% 11.2% 15.9% 20.1% 23.9% 27.4% 30.6% 33.5% 34.4% 36.2% 38.8% 56.1% 65.8% 72.0% 76.3%
60 4.9% 5.9% 11.1% 15.8% 20.0% 23.8% 27.3% 30.4% 33.3% 34.2% 36.0% 38.6% 56.0% 65.8% 72.0% 76.3%
70 5.7% 5.8% 11.0% 15.7% 19.9% 23.6% 27.1% 30.2% 33.1% 34.0% 35.9% 38.4% 55.9% 65.7% 71.9% 76.2%
80 6.5% 5.8% 10.9% 15.6% 19.7% 23.5% 26.9% 30.1% 32.9% 33.8% 35.7% 38.2% 55.8% 65.6% 71.8% 76.1%
90 7.3% 5.7% 10.8% 15.4% 19.6% 23.3% 26.7% 29.9% 32.7% 33.6% 35.5% 38.0% 55.6% 65.5% 71.7% 76.1%
100 8.1% 5.7% 10.8% 15.3% 19.4% 23.2% 26.6% 29.7% 32.5% 33.4% 35.3% 37.9% 55.5% 65.4% 71.6% 76.0%
200 16.2% 5.2% 9.9% 14.2% 18.0% 21.6% 24.8% 27.8% 30.5% 31.4% 33.3% 36.0% 54.2% 64.3% 70.8% 75.3%
300 24.4% 4.7% 9.0% 13.0% 16.6% 19.9% 23.0% 25.8% 28.4% 29.2% 31.2% 34.0% 52.8% 63.2% 69.9% 74.5%
400 32.5% 4.2% 8.1% 11.7% 15.1% 18.1% 21.0% 23.7% 26.2% 26.9% 29.0% 31.8% 51.3% 62.1% 69.0% 73.7%
500 40.6% 3.8% 7.2% 10.5% 13.5% 16.3% 19.0% 21.4% 23.8% 24.5% 26.6% 29.6% 49.7% 60.9% 68.0% 72.9%
600 48.7% 3.3% 6.3% 9.2% 11.9% 14.4% 16.8% 19.1% 21.2% 21.9% 24.1% 27.1% 48.0% 59.5% 66.9% 72.0%
700 56.9% 2.8% 5.4% 7.8% 10.2% 12.4% 14.5% 16.5% 18.5% 19.1% 21.4% 24.5% 46.2% 58.1% 65.8% 71.0%
800 65.0% 2.2% 4.4% 6.5% 8.4% 10.3% 12.1% 13.9% 15.5% 16.0% 18.5% 21.7% 44.2% 56.6% 64.5% 70.0%
900 73.1% 1.7% 3.4% 5.0% 6.6% 8.1% 9.6% 11.0% 12.4% 12.8% 15.3% 18.7% 42.1% 55.0% 63.2% 68.9%
1000 81.2% 1.2% 2.4% 3.6% 4.7% 5.8% 6.9% 7.9% 9.0% 9.3% 11.9% 15.5% 39.8% 53.3% 61.8% 67.7%
1230 99.9% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 2.9% 6.9% 33.9% 48.7% 58.1% 64.6%
Total percent damage prevented by the target armor after ArP is applied
FINAL DAMAGE TABLE
Level 80 Level 83 Target Armor
ArP %AR 1000 2000 3000 4000 5000 6000 7000 8000 8317 9000 10000 20000 30000 40000 50000
0 0.0% 938 884 835 792 753 717 685 656 647 629 604 432 337 276 234
10 0.8% 939 885 837 793 754 719 687 657 649 630 605 434 338 277 234
20 1.6% 939 886 838 795 756 721 689 659 651 632 607 435 339 277 235
30 2.4% 940 886 839 796 757 722 690 661 652 634 609 436 340 278 235
40 3.2% 940 887 840 797 759 724 692 663 654 636 611 437 341 279 236
50 4.1% 941 888 841 799 761 726 694 665 656 638 612 439 342 280 237
60 4.9% 941 889 842 800 762 727 696 667 658 640 614 440 342 280 237
70 5.7% 942 890 843 801 764 729 698 669 660 641 616 441 343 281 238
80 6.5% 942 891 844 803 765 731 699 671 662 643 618 442 344 282 239
90 7.3% 943 892 846 804 767 733 701 673 664 645 620 444 345 283 239
100 8.1% 943 892 847 806 768 734 703 675 666 647 621 445 346 284 240
200 16.2% 948 901 858 820 784 752 722 695 686 667 640 458 357 292 247
300 24.4% 953 910 870 834 801 770 742 716 708 688 660 472 368 301 255
400 32.5% 958 919 883 849 819 790 763 738 731 710 682 487 379 310 263
500 40.6% 962 928 895 865 837 810 786 762 755 734 704 503 391 320 271
600 48.7% 967 937 908 881 856 832 809 788 781 759 729 520 405 331 280
700 56.9% 972 946 922 898 876 855 835 815 809 786 755 538 419 342 290
800 65.0% 978 956 935 916 897 879 861 845 840 815 783 558 434 355 300
900 73.1% 983 966 950 934 919 904 890 876 872 847 813 579 450 368 311
1000 81.2% 988 976 964 953 942 931 921 910 907 881 845 602 467 382 323
1230 99.9% 1000 1000 1000 1000 1000 1000 1000 1000 1000 971 931 661 513 419 354
Total effective damage from a level 80 white hit of 1000 on a level 83 target after ArP is applied
PERCENT DPS INCREASE TABLE
Level 80 Level 83 Target Armor
ArP %AR 1000 2000 3000 4000 5000 6000 7000 8000 8317 9000 10000 20000 30000 40000 50000
0 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
10 0.8% 0.1% 0.1% 0.1% 0.2% 0.2% 0.2% 0.3% 0.3% 0.3% 0.3% 0.3% 0.3% 0.3% 0.3% 0.3%
20 1.6% 0.1% 0.2% 0.3% 0.3% 0.4% 0.5% 0.5% 0.6% 0.6% 0.6% 0.6% 0.6% 0.6% 0.6% 0.6%
30 2.4% 0.2% 0.3% 0.4% 0.5% 0.6% 0.7% 0.8% 0.8% 0.9% 0.9% 0.9% 0.9% 0.8% 0.8% 0.8%
40 3.2% 0.2% 0.4% 0.5% 0.7% 0.8% 0.9% 1.0% 1.1% 1.2% 1.2% 1.2% 1.1% 1.1% 1.1% 1.1%
50 4.1% 0.3% 0.5% 0.7% 0.9% 1.0% 1.2% 1.3% 1.4% 1.5% 1.5% 1.4% 1.4% 1.4% 1.4% 1.4%
60 4.9% 0.3% 0.6% 0.8% 1.0% 1.2% 1.4% 1.6% 1.7% 1.8% 1.7% 1.7% 1.7% 1.7% 1.7% 1.7%
70 5.7% 0.4% 0.7% 0.9% 1.2% 1.4% 1.6% 1.8% 2.0% 2.0% 2.0% 2.0% 2.0% 2.0% 2.0% 2.0%
80 6.5% 0.4% 0.8% 1.1% 1.4% 1.6% 1.9% 2.1% 2.3% 2.3% 2.3% 2.3% 2.3% 2.3% 2.3% 2.3%
90 7.3% 0.5% 0.9% 1.2% 1.5% 1.8% 2.1% 2.4% 2.6% 2.7% 2.6% 2.6% 2.6% 2.6% 2.6% 2.6%
100 8.1% 0.5% 1.0% 1.4% 1.7% 2.0% 2.3% 2.6% 2.9% 3.0% 2.9% 2.9% 2.9% 2.9% 2.9% 2.8%
200 16.2% 1.0% 1.9% 2.7% 3.5% 4.2% 4.8% 5.4% 5.9% 6.1% 6.1% 6.1% 6.0% 5.9% 5.9% 5.9%
300 24.4% 1.5% 2.9% 4.2% 5.3% 6.4% 7.4% 8.3% 9.2% 9.4% 9.4% 9.4% 9.2% 9.1% 9.1% 9.0%
400 32.5% 2.0% 3.9% 5.6% 7.2% 8.7% 10.1% 11.4% 12.6% 13.0% 12.9% 12.9% 12.7% 12.6% 12.5% 12.4%
500 40.6% 2.6% 4.9% 7.2% 9.2% 11.2% 13.0% 14.7% 16.3% 16.7% 16.7% 16.7% 16.4% 16.2% 16.1% 16.0%
600 48.7% 3.1% 6.0% 8.7% 11.3% 13.7% 16.0% 18.1% 20.2% 20.8% 20.8% 20.7% 20.3% 20.1% 20.0% 19.9%
700 56.9% 3.6% 7.1% 10.3% 13.4% 16.4% 19.1% 21.8% 24.3% 25.1% 25.1% 25.0% 24.5% 24.3% 24.1% 24.0%
800 65.0% 4.2% 8.2% 12.0% 15.6% 19.1% 22.5% 25.7% 28.8% 29.8% 29.7% 29.6% 29.1% 28.8% 28.6% 28.4%
900 73.1% 4.7% 9.3% 13.7% 17.9% 22.1% 26.0% 29.9% 33.6% 34.8% 34.7% 34.6% 33.9% 33.6% 33.3% 33.1%
1000 81.2% 5.3% 10.4% 15.4% 20.3% 25.1% 29.8% 34.4% 38.8% 40.2% 40.1% 40.0% 39.2% 38.7% 38.4% 38.2%
1230 99.9% 6.6% 13.1% 19.7% 26.2% 32.8% 39.3% 45.9% 52.5% 54.5% 54.4% 54.2% 53.0% 52.3% 51.9% 51.6%
Total percent damage increase due to ArP

Percentage-based ArP Edit

Since some talents operate on percentages such as Mace Specialization and Piercing Shots they operate onto the already existing modifiers. Instead of ignoring armor from the base value of the target immediately, it takes into account the effects of Sunder Armor, Expose Armor, Faerie Fire and then does a post operation of the value when it calculates mace specialization and piercing shots.

In addition, what this entails for percentage based ArP is that the higher the armor the greater the ArP raw value and the lesser the armor the less ArP raw value. That is to say, percentage based ArP suffers diminishing returns for heavily sundered units in terms of raw ArP value, especially for those with very low armor value.

Armor penetration benefits Edit

Armor penetration will increase the normal damage (white) and the critical damage (yellow) by a percentage significant for virtually every armored target, however, for lightly armored targets it is much greater than having no armor ignore at all.

From the perspective of a warrior, because armor penetration increases damage, he will get a substantial gain in rage generation as a result of higher armor penetration. Also, armor penetration causes the warrior to increase Execute damage.

Opportunistically, from a PvP point of view, a warrior or rogue may apply fewer stacks of sunders or expose armor, assuming they have a higher armor pen than usual, because they have a head start on armor ignored. Or they may choose to boost the sustained damage further by a significant percentage by applying more stacks or combo points.

Skills and talents Edit

Itemization Edit

Warrior sets:

Rogue sets:

Hunter sets:

Weapons:

Trinkets:

Enchants:

Gems:

Countering armor penetrationEdit

To effectively neutralize or counter the effectiveness of armor penetration one could simply increase their armor value in combat time with drinking potions such as [Greater Stoneshield Potion], changing to Bear Form or Moonkin Form, equipping a Shield, dropping a Stoneskin Totem, casting Inner Fire or Devotion Aura, or speccing in Toughness and Thick Hide, or proccing Ancestral Healing or Inspiration intentionally. You can also enchant your gear with armor. For example: [Enchant Cloak - Major Armor] to counter armor pen. In short, armor penetration is really only countered by more armor.

Patch changes Edit

  • Patch 3.1.2 capped to 100% (or 1232 armor penetration rating)
  • Patch 3.1 increased the amount of armor penetration provided by armor penetration rating by 25%.
  • As of patch 2.4.1, armor penetration will now display on the character sheet (armor penetration displays in the hit rating section).

See also Edit

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