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Shield Skill
From FFXI Wiki
(Redirected from Shield block rate)
Shield skill is a combat skill that determines a player's ability to activate an equipped shield to block an incoming physical attack. When a physical attack is successfully blocked by a Shield, the damage taken from the attack is significantly reduced.
- Shields can block any physical attacks coming from the front of the player
- The player does not need to be engaged to an enemy to block an attack.
- All shields have a hidden game statistic: Shield Size.
- While not viewable in game, it is programmed into the game to each individual shield and can be seen on the individual wiki pages for each shield.
- The amount of damage reduction from a successful shield block is based on the shield size, its DEF, Damage Taken, and Shield Defense Bonus.
PercentDamageBlocked = SizeDamageReduction + (ShieldDEF / ((max(ShieldItemLevel, 99) - 99) / 10 + 2))- Only the listed DEF value on the shield itself and its augments are included in
ShieldDEF. No other source of DEF is factored in.
- Only the listed DEF value on the shield itself and its augments are included in
FinalDamageTaken = (IncomingBaseDamage - ShieldDefenseBonus) × (1 - PercentDamageBlocked/100) × (1 - PDT/100)- Where
PDTis the sum of "Physical Damage Taken -%" and "Damage Taken -%" from gear, up to the gear cap of 50.
- Where
- The total damage reduction from Shield blocks is not subject to the -87.5% cap on Physical Damage Taken.
- A shield's block rate is determined by the attacking enemy's combat skill (determined by their level), the shield's Size Base Block Rate, and the player's shield skill, such that:
BlockRate = SizeBaseBlockRate + ((ShieldSkill - AttackerCombatSkill) × 0.2325)- 0.2325 is the average skill:block rate conversion over all skill ranges. For example, some skill levels the conversion factor is 0.25, for others it is 0.2.
This average is used as all the Shield Skill:Block Rate tiers are currently unknown and this yields fairly accurate observable results. - The spell Reprisal and the Job Ability Palisade artificially increases the shield block rate by a set percent independent of the above formula.
- An Attackers Combat Skill can be determined by reversing the block rate formula using your Known block rates from parsing.
AttackerSkill = ((-1 × (ActualBlockRate - SizeBaseBlockRate) ÷ 0.2325) + ShieldSkill- where
ActualBlockRateis equal to your Parsed unmodified block rate, and is greater than 5%, but less than 100%.
it is impossible to determine attacker skill above or below those thresholds due to the minimum and maximum rate for blocking. - When obtaining this value in parsing, Use a substantial data set, without block rate gear, and without gear changing for the length of the parse.
- where
- Ultimate shields do not follow normal rules regarding block rate and damage reduction. See the table below or their individual pages.
- The job trait Shield Mastery prevents the casting of spells from being interrupted by a physical attack if all hits while casting are successfully blocked and allows successful blocks to generate additional TP return for the player.
Standard Shields
| Shield Size | Base Damage Reduction | Base Block Rate |
|---|---|---|
| 1 | -20% | 55% |
| 2 | -40% | 40% |
| 3 | -50% | 45% |
| 4 | -65% | 30% |
Ultimate Shields
| Shield | Total Damage Reduction | Base Block Rate |
|---|---|---|
 
|
-75% | 50% |
 
|
-60% | ~108% |
Shield Skill Caps
| Job | Grade | Level 49 | Level 99 |
|---|---|---|---|
| PLD | A+ | 150 | 424 |
| WAR | C+ | 139 | 378 |
| WHM | D | 133 | 334 |
| BST | E | 124 | 300 |
| RDM | F | 114 | 265 |
| THF | F | 114 | 265 |
