Shield AC stacking

[crobi]

Hi, here's some information about the stacking of enhancements that increase your shield AC that I wanted to share

Character:

• +3 Shield Enhancement Bonus (Shield Expertise, fighter enhancement)
• +15% Shield AC (Dwarven Shield Mastery, racial enhancement)
• +15% Shield AC (Sacred Shield Mastery, paladin enhancement)
• +15% Shield AC (Stalwart Shield Mastery, fighter enhancement)
• +50% Shield AC (Reinforced Shield, fighter enhancement)
• +50% Shield AC (Reinforced Shield, paladin enhancement)
• +50% Shield AC (Shield Provess, unyielding sentinel epic destiny)
• 10% Total AC Bonus (Combat Expertise, feat)

Shields:

AC numbers as displayed in various places:

Name                          inventory  equipped  char-sheet  total  predicted
None                           0          0         0          118    118.8
+2 Spiritcraft Buckler         4          6        20          141    141.5
+1 Magecraft Shield            9         12        35          157    157.4
+2 Magecraft Shield           10         13        38          161    160.98
+2 Mountain Shield            12         15        43          162    162.7
Madstone Shield               13         16        46          169    170.72
+4 Mountain Shield            14         17        49          173    173.97
Adherence                     14         17        49          173    173.97
+7 Planeforged Shield         19         22        64          189    190.2

Stacking:

Apparently the increase to enhancement bonus is applied first, then all shield ac bonuses are applied (stacking additively), finally the combat expertise bonus is applied:
(shield armor + shield expertise bonus) * (100% + sum of all shield ac bonuses) * (110% from combat expertise)
Or in the case of my test character:
(shield armor + 3) * 2.95 * 1.1 = (shield armor + 3) * 3.245

Other notes:

• Shield bashing seems to be fixed now, there is no cooldown on shield bashes. Apparently it was broken before (http://ddowiki.com/page/Improved_Shield_Bash)
• Purified Weapon and Annoited Weapon (unyielding sentinel epic destiny) applies to shields
• Pierce Silver (epic feat) does not apply to shields
• The charater used to get these numbers had only very basic equipment (randomly picked up in the test dojo and the AH), but used almost all enhancement points and feats on AC / shield bonuses
• The mobility feat got nerfed and only provides +1 max dex bonus (used to be +2)