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Inner mechanics of Shields (Borderlands 2)

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WIP

  1. Actually explain what "grades" are.

All data was compiled via extracting UnrealClasses and analyzing them.
Please read Stat modifiers before continuing to have some idea about calculations used in game.
All these calculations refer to shields themselves as items, not including skills etc. All grades of a certain shield statistic are summarized before further calculations:
\sum Grades = TypeGrade + MaterialGrade + AccessoryGrade + BatteryGrade + BodyGrade + CapacitorGrade

Basic capacity, recharge rate and recharge delay calculations (item card)

Stat Base value Grade Level scaling Basic formula
Capacity 64 +3% 1.13ShieldLevel Capacity =
\begin{cases}
64 * 1.13^{ShieldLevel} * (1 + 0.03 * \sum CapacityGrades), & \text{if }\sum >0 \\
64 * 1.13^{ShieldLevel} / (1 - 0.03 * \sum CapacityGrades), & \text{if }\sum <0
\end{cases}
Recharge Rate 10.24 +3% 1.13ShieldLevel RechargeRate =
\begin{cases}
10.24 * 1.13^{ShieldLevel} * (1 + 0.03 * \sum RechargeRateGrades), & \text{if }\sum >0 \\
10.24 * 1.13^{ShieldLevel} / (1 - 0.03 * \sum RechargeRateGrades), & \text{if }\sum <0
\end{cases}
Recharge Delay 3.50 -4% None RechargeDelay =
\begin{cases}
3.5 * (1 - 0.04 * \sum RechargeDelayGrades), & \text{if }\sum <0 \\
3.5 / (1 + 0.04 * \sum RechargeDelayGrades), & \text{if }\sum >0
\end{cases}

Special effects calculations (item card)

A_Item part defines what model of shield this is and it's special effects. Unique/Legendary/Seraph shields have their own specific A_Item which, unless listed, have the exact same stats for their special effect as their respective common shield's A_Item. For example, Fabled Tortoise isn't listed because it has the same special effect as Turtle Shield.

Model A_Item Special01 Special02(/03/04)
Effect Base Grade Effect Base Grade
Shield Shield_Standard -
Absorb Shield_Absorption Chance to absorb bullets1 15% +0.8% -
Sponge Iris_Seraph_Shield_Sponge Chance to absorb bullets1 20% +0.8%
Booster Shield_Booster Chance to drop shield booster1 5% +0.275%
Big Boom Blaster Iris_Seraph_Shield_Booster Chance to drop shield booster1 13% +0.275%
Turtle Shield_Juggernaut Max Health decrease -32 +0.72
Hoplite Iris_Seraph_Shield_Juggernaut Max Health decrease -40 +0.72
Roid Shield_Roid Roid damage2 20 +1.6
Pun-chee Iris_Seraph_Shield_Pun-chee Roid damage2 21 +1.6
Spike Shield_Spike_* Spike damage 40 +1.6
The Rough Rider Shield_Buckler Max Health increase2 28 +0.88
Adaptive Shield_Chimera Elemental resistance1,3 25% +1.3% Max Health increase3 16 +0.88
Amplify Shield_Impact Amp damage 16 +0.76 Amp Shot drain4 -19.2 -1
The Bee Shield_Impact_05_Legendary Amp damage 80 +0.76 Amp Shot drain 0 0
Elemental Nova Shield_Nova_Corrosive/Fire/Shock Nova damage 80 +4.4 Nova radius1 800 +28
Explosive Nova Shield_Nova_Explosive Nova damage 104 +4.4 Nova radius1 800 +28
Antagonist Aster_Seraph_Antagonist_Shield Reflected bullet damage1 700% +20% Reflect damage reduction1 40% +1%
Hide of Terramorphous Shield_Roid_05_ThresherRaid Roid damage2 20 +1.6 Nova damage
Nova radius1
Spike damage
80
800
40
+4.4
+28
+1.6

Damage/health-based special effects have level scaling: SpecialEffect = (Base + Grade * \sum SpecialGrades) * 1.13^{ShieldLevel}
1Percentage/radius-based special effects have no level scaling: SpecialEffect = Base + Grade * \sum SpecialGrades
2Minimum allowed Grade on this Special effect is -11. If the sum of all Special grades is lower than -11, then -11 is used.
3Minimum allowed Grade on this Special effect is -16. If the sum of all Special grades is lower than -16, then -16 is used.
4Grade calculation is applied after level scaling: AmpShotDrain = -19.2 * 1.13^{ShieldLevel} - \sum Special02Grades

Static special effects

These special effects have a description but don't have exact numbers on item card.

Shield Static special effect description
Fabled Tortoise -44.4%/+50% movement speed when active/empty
Hoplite +0.95*64*1.13ShieldLevel capacity for each Hoplite equipped in party; -20%/-33.3%/-42.9%/-50% movement speed
Neogenator 0.05%/s MaxHP regeneration when active; 3%/s MaxHP regeneration for 3s on shield damage
Evolution 0.08%/s MaxHP regeneration when active; 3.9%/s MaxHP regeneration for 3s on shield damage
Captain Blade's Manly Man Shield +92.184690*1.13ShieldLevel (not confirmed) explosive damage to all melee attacks; +65% elemental vulnerability
Blockade damage resistance: +5%*ShieldLevel when full, +7.5%+0.5%*ShieldLevel when partially full (not confirmed)

A_Item, Material and Accessory Grades

Material part visually colours the shield with Rarity/Unique/Legendary/Seraph skin.
Accessory visually is the part where all Body, Battery and Capacitor connect to. There are few that actually modify Grades.

Model Part Capacity Recharge Rate Recharge Delay Special01 Special02(/03/04)
All Material1_Common_* 0 0 0 0 0
Quest rewards only Material2_Uncommon_Balanced +3 +2 +2 0 0
Material2_Uncommon_Capacity +5 0 0 0 0
Material2_Uncommon_Delay 0 0 +5 0 0
Material2_Uncommon_Rate 0 +5 0 0 0
Material2_Uncommon_Special01 0 0 0 +4 +1
Material2_Uncommon_Special02 0 0 0 +2 +4
Shield Material2_Uncommon_NoSpecial +4 +2 +2 0 0
Material3_Rare_NoSpecial +8 +4 +4 0 0
Material4_VeryRare_NoSpecial -20 +150 +40 0 0
Cradle A_Item.Shield_Standard_05_Legendary -50 +150 -12 0 0
Material5_Legendary_Standard +15 0 +9 0 0
Absorb Material2_Uncommon_Absorption +4 0 0 +6 +6
Material3_Rare_Absorption +8 0 0 +12 +12
Material4_VeryRare_Absorption +12 0 0 +18 +18
Sham Material5_Legendary_AbsorptionNormal -15 0 +15 +80 0
Transformer Material5_Legendary_AbsorptionShock +15 -8 -8 +18 0
Sponge Iris_Seraph_Shield_Sponge +0.052 +0.052 -0.052 0 0
Iris_Seraph_Shield_Sponge_Part_Material +12 0 0 +18 +18
Booster Material2_Uncommon_Booster +4 0 0 +6 +6
Material3_Rare_Booster +8 0 0 +12 +12
Material4_VeryRare_Booster +12 0 0 +18 +18
Pot O' Gold Material4_VeryRare_Booster_PotOGold +12 0 0 0 0
Whiskey Tango Foxtrot Material5_Legendary_Booster +12 0 0 +28 +18
Big Boom Blaster Iris_Seraph_Shield_Booster 1.15x1
+0.122
+0.052 -0.052 0 0
Iris_Seraph_Shield_Booster_Material 12 -5 -5 9 9
Turtle A_Item.Shield_Juggernaut +25 0 0 0 0
Material2_Uncommon_Juggernaut +4 0 0 +6 +6
Material3_Rare_Juggernaut +8 0 0 +12 +12
Material4_VeryRare_Juggernaut +12 0 0 +18 +18
Fabled Tortoise Material5_Legendary_Juggernaut +125 +50 +15 -25 0
Hoplite Iris_Seraph_Shield_Juggernaut +25 0 0 0 0
Iris_Seraph_Shield_Juggernaut_Material +104 +50 +15 -30 0
Roid A_Item.Shield_Roid 0 1.1x1 1.15x1 0 0
Material2_Uncommon_Roid +4 0 0 +6 +6
Material3_Rare_Roid +8 0 0 +12 +12
Material4_VeryRare_Roid +12 0 0 +18 +18
Order Accessory2_Roid_Order 0 0 0 +5 0
Love Thumper Material4_VeryRare_Roid_LoveThumper +12 0 -1500 +18 +18
Hide of Terramorphous Material5_Legendary_Roid_ThresherRaid +15 +12 0 +40 +30/+22/+10
Accessory9_01_Roid_ThresherRaid 0 0 0 0 0/-5/-5
Accessory9_02_Roid_ThresherRaid 0 0 0 0 0/-3/-3
Accessory9_03_Roid_ThresherRaid 0 0 0 0 0/0/0
Accessory9_04_Roid_ThresherRaid 0 0 0 0 0/+3/+3
Accessory9_05_Roid_ThresherRaid 0 0 0 0 0/+5/+5
Pun-chee Iris_Seraph_Shield_Pun-chee +0.052 1.1x1
+2.02
1.15x1
-0.302
0 0
Iris_Seraph_Shield_Pun-chee_Part_Material +12 0 0 +18 +18
Nova
Spike
Material2_Uncommon_NovaSpike_* +4 0 0 +6 +6
Material3_Rare_NovaSpike_* +8 0 0 +12 +12
Material4_VeryRare_NovaSpike_* +12 0 0 +18 +18
Flame of the Firehawk Material4_VeryRare_Nova_Phoenix +12 0 0 +18 +18
Deadly Bloom Material5_Legendary_Nova_DeadlyBloom +12 +50 -10 +12 +12
Black Hole Material5_Legendary_Nova_Singularity +16 0 0 +30 0
Impaler Material5_Legendary_Spike +15 0 +12 +20 +18
Adaptive Material2_Uncommon_Chimera +4 0 0 +6 +6
Material3_Rare_Chimera +8 0 0 +12 +12
Material4_VeryRare_Chimera +12 0 0 +18 +18
Neogenator Material5_Legendary_Chimera -25 0 +20 +28 +30
Evolution Orchid_Seraph_Anshin_Shield_Material 0 0 +30 +28 +30
Amplify Material2_Uncommon_Impact +3 0 +3 +6 +6
Material3_Rare_Impact +6 0 +6 +12 +12
Material4_VeryRare_Impact +9 0 +9 +18 +18
The Bee
(before 1.2.0)
A_Item.Shield_Impact_05_Legendary -50 +150 -12 0 0
Material5_Legendary_Impact +30 0 +9 +50 0
The Bee
(after 1.2.0)
A_Item.Shield_Impact_05_Legendary -50 +75 -26 0 0
Material5_Legendary_Impact +30 0 +9 +20 0
Captain Blade's Manly Man Shield Material3_Rare_Blade +10 +5 +4 0 0
The Rough Rider Material3_Rare_Buckler 0 0 0 +12 +12
Antagonist Aster_Seraph_Antagonist_Shield +35 +8 +12 0 0
Blockade Aster_Seraph_Blockade_Shield +20 +20 0 0 0

1Applied after all Grade calculatons. Uniques/Legendaries/Seraph excluded, as they have their own A_Item.
2Shifts are added to Grade*SumOfAllGrades, reciproc check included.
With 1 and 2, complete formula for (example) Capacity calculation becomes Capacity =
\begin{cases}
CapacityMultiplier * 64 * 1.13^{ShieldLevel} * (1 + CapacityShift + 0.03 * \sum CapacityGrades), & \text{if }CapacityShift + 0.03 * \sum >0 \\
CapacityMultiplier * 64 * 1.13^{ShieldLevel} / (1 + CapacityShift - 0.03 * \sum CapacityGrades), & \text{if }CapacityShift + 0.03 * \sum <0
\end{cases}

Body, Battery and Capacitor (copy from Shield)

This is a table of shield bodies, batteries and capacitors and their grade modifiers. All three parts of the shield from the same manufacturer have the same grade modifiers.

# Manufacturer Body Battery Capacitor Capacity Recharge Rate Recharge Delay Special01 Special02
01 Tediore Shield Body Tediore Shield Battery Tediore Shield Capacitor Tediore -4 +4 +4 +1 +1
02 Bandit Shield Body Bandit Shield Battery Bandit Shield Capacitor Bandit +1 +8 -2 -6 -6
03 Vladof Shield Body Vladof Shield Battery Vladof Shield Capacitor Vladof -1 +3 -1 0 0
04 Dahl Shield Body Dahl Shield Battery Dahl Shield Capacitor Dahl -2 -1 +7 -1 -1
05 Anshin Shield Body Anshin Shield Battery Anshin Shield Capacitor Anshin +5 -8 -7 +2 +2
05 Maliwan Shield Body Maliwan Shield Battery Maliwan Shield Capacitor Maliwan -5 +1 0 +8 +8
06 Torgue Shield Body Torgue Shield Battery Torgue Shield Capacitor Torgue +3 +2 -2 -5 -5
07 Hyperion Shield Body Hyperion Shield Battery Hyperion Shield Capacitor Hyperion -4 -2 +8 +3 +3
08 Pangolin Shield Body Pangolin Shield Battery Pangolin Shield Capacitor Pangolin +8 -7 -8 -3 -3

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